diff --git a/.travis.yml b/.travis.yml
index d462374b3..cfab5839c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -42,6 +42,12 @@ jobs:
       env:
         - TARGET="linux-juce-strict"
 
+    # linux with default, tests python code
+    - os: linux
+      compiler: gcc
+      env:
+        - TARGET="pylint"
+
 before_install:
   - sh ${TRAVIS_BUILD_DIR}/.travis/before_install.sh
 
diff --git a/.travis/install.sh b/.travis/install.sh
index 7a12e1643..806ed96c9 100755
--- a/.travis/install.sh
+++ b/.travis/install.sh
@@ -89,17 +89,6 @@ elif [ "${TARGET}" = "macos" ]; then
         pkg-config \
         apple-x86-setup
 
-# mkdir /tmp/osx-macports-pkgs
-# cd /tmp/osx-macports-pkgs
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-flac_1.2.1-1_all.deb
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-libiconv_1.14-0_all.deb
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-liblo_0.26-1_all.deb
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-libogg_1.3.0-1_all.deb
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-libsndfile_1.0.25-0_all.deb
-# wget https://launchpad.net/~kxstudio-team/+archive/ubuntu/builds/+files/apple-macports-libvorbis_1.3.3-0_all.deb
-# cd ~
-# rm -r /tmp/osx-macports-pkgs
-
 elif [ "${TARGET}" = "win32" ]; then
     sudo apt-get install -y \
         mingw32-x-gcc \
@@ -112,15 +101,12 @@ elif [ "${TARGET}" = "win64" ]; then
         mingw64-x-gcc \
         mingw64-x-pkgconfig
 
-fi
+elif [ "${TARGET}" = "pylint" ]; then
+    sudo apt-get install -y \
+        pylint3 \
+        python3-liblo \
+        python3-pyqt5 python3-pyqt5.qtsvg python3-pyqt5.qtopengl python3-rdflib \
+        pyqt5-dev-tools \
+        qtbase5-dev
 
-#     mingw32-x-fluidsynth
-#     mingw32-x-fftw
-#     mingw32-x-liblo
-#     mingw32-x-mxml
-#     mingw32-x-zlib
-#     mingw64-x-fluidsynth
-#     mingw64-x-fftw
-#     mingw64-x-liblo
-#     mingw64-x-mxml
-#     mingw64-x-zlib
+fi
diff --git a/.travis/script-pylint.sh b/.travis/script-pylint.sh
new file mode 100755
index 000000000..d0c7ad095
--- /dev/null
+++ b/.travis/script-pylint.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -e
+
+pylint3 \
+    --extension-pkg-whitelist=PyQt5 \
+    --disable=\
+bad-whitespace,\
+bare-except,\
+blacklisted-name,\
+duplicate-code,\
+fixme,\
+invalid-name,\
+line-too-long,\
+missing-docstring,\
+too-few-public-methods,\
+too-many-arguments,\
+too-many-branches,\
+too-many-instance-attributes,\
+too-many-lines,\
+too-many-locals,\
+too-many-public-methods,\
+too-many-return-statements,\
+too-many-statements,\
+unused-argument,\
+wrong-import-position \
+    source/frontend/carla_{app,backend,backend_qt,settings,shared,utils,widgets}.py
+
+pylint3 \
+    --extension-pkg-whitelist=PyQt5 \
+    -E \
+    source/frontend/carla_{database,host,skin}.py
diff --git a/source/frontend/carla_app.py b/source/frontend/carla_app.py
index ab619031d..e4ee6e4f4 100644
--- a/source/frontend/carla_app.py
+++ b/source/frontend/carla_app.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 # Carla application
-# Copyright (C) 2013-2019 Filipe Coelho <falktx@falktx.com>
+# Copyright (C) 2013-2020 Filipe Coelho <falktx@falktx.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -19,14 +19,36 @@
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Global)
 
+import os
+import sys
+
+# ------------------------------------------------------------------------------------------------------------
+# Imports (ctypes)
+
+from ctypes import CDLL, RTLD_GLOBAL
+
+# ------------------------------------------------------------------------------------------------------------
+# Imports (PyQt5)
+
 from PyQt5.QtCore import QT_VERSION, Qt, QCoreApplication
-from PyQt5.QtGui import QColor, QPalette
+from PyQt5.QtGui import QColor, QIcon, QPalette
 from PyQt5.QtWidgets import QApplication
 
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
 
-from carla_shared import *
+from carla_backend import kIs64bit, LINUX, MACOS, WINDOWS
+
+from carla_shared import (
+    CARLA_KEY_MAIN_USE_PRO_THEME,
+    CARLA_KEY_MAIN_PRO_THEME_COLOR,
+    CARLA_DEFAULT_MAIN_USE_PRO_THEME,
+    CARLA_DEFAULT_MAIN_PRO_THEME_COLOR,
+    CWD, VERSION,
+    getPaths,
+    QSafeSettings,
+    gCarla
+)
 
 # ------------------------------------------------------------------------------------------------------------
 
@@ -34,7 +56,7 @@ class CarlaApplication(object):
     def __init__(self, appName = "Carla2", libPrefix = None):
         object.__init__(self)
 
-        pathBinaries, pathResources = getPaths(libPrefix)
+        pathBinaries, _ = getPaths(libPrefix)
 
         # Needed for MacOS and Windows
         if os.path.exists(CWD) and (MACOS or WINDOWS):
@@ -87,126 +109,10 @@ class CarlaApplication(object):
         proThemeColor = settings.value(CARLA_KEY_MAIN_PRO_THEME_COLOR, CARLA_DEFAULT_MAIN_PRO_THEME_COLOR, str).lower()
 
         if MACOS or proThemeColor == "black":
-            self.fPalBlack = QPalette()
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Window, QColor(14, 14, 14))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Window, QColor(17, 17, 17))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Window, QColor(17, 17, 17))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.WindowText, QColor(83, 83, 83))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.WindowText, QColor(240, 240, 240))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.WindowText, QColor(240, 240, 240))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Base, QColor(6, 6, 6))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Base, QColor(7, 7, 7))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Base, QColor(7, 7, 7))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.AlternateBase, QColor(12, 12, 12))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.AlternateBase, QColor(14, 14, 14))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.AlternateBase, QColor(14, 14, 14))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.ToolTipBase, QColor(4, 4, 4))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.ToolTipBase, QColor(4, 4, 4))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.ToolTipBase, QColor(4, 4, 4))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.ToolTipText, QColor(230, 230, 230))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.ToolTipText, QColor(230, 230, 230))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.ToolTipText, QColor(230, 230, 230))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Text, QColor(74, 74, 74))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Text, QColor(230, 230, 230))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Text, QColor(230, 230, 230))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Button, QColor(24, 24, 24))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Button, QColor(28, 28, 28))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Button, QColor(28, 28, 28))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.ButtonText, QColor(90, 90, 90))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.ButtonText, QColor(240, 240, 240))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.ButtonText, QColor(240, 240, 240))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Light, QColor(191, 191, 191))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Light, QColor(191, 191, 191))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Light, QColor(191, 191, 191))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Midlight, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Midlight, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Midlight, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Dark, QColor(129, 129, 129))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Dark, QColor(129, 129, 129))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Dark, QColor(129, 129, 129))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Mid, QColor(94, 94, 94))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Mid, QColor(94, 94, 94))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Mid, QColor(94, 94, 94))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Shadow, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Shadow, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Shadow, QColor(155, 155, 155))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Highlight, QColor(14, 14, 14))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Highlight, QColor(60, 60, 60))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Highlight, QColor(34, 34, 34))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.HighlightedText, QColor(83, 83, 83))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.HighlightedText, QColor(255, 255, 255))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.HighlightedText, QColor(240, 240, 240))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.Link, QColor(34, 34, 74))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.Link, QColor(100, 100, 230))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.Link, QColor(100, 100, 230))
-            self.fPalBlack.setColor(QPalette.Disabled, QPalette.LinkVisited, QColor(74, 34, 74))
-            self.fPalBlack.setColor(QPalette.Active,   QPalette.LinkVisited, QColor(230, 100, 230))
-            self.fPalBlack.setColor(QPalette.Inactive, QPalette.LinkVisited, QColor(230, 100, 230))
-            self.fApp.setPalette(self.fPalBlack)
+            self.createPaletteBlack()
 
         elif proThemeColor == "blue":
-            self.fPalBlue = QPalette()
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Window, QColor(32, 35, 39))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Window, QColor(37, 40, 45))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Window, QColor(37, 40, 45))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.WindowText, QColor(89, 95, 104))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.WindowText, QColor(223, 237, 255))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.WindowText, QColor(223, 237, 255))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Base, QColor(48, 53, 60))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Base, QColor(55, 61, 69))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Base, QColor(55, 61, 69))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.AlternateBase, QColor(60, 64, 67))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.AlternateBase, QColor(69, 73, 77))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.AlternateBase, QColor(69, 73, 77))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.ToolTipBase, QColor(182, 193, 208))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.ToolTipBase, QColor(182, 193, 208))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.ToolTipBase, QColor(182, 193, 208))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.ToolTipText, QColor(42, 44, 48))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.ToolTipText, QColor(42, 44, 48))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.ToolTipText, QColor(42, 44, 48))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Text, QColor(96, 103, 113))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Text, QColor(210, 222, 240))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Text, QColor(210, 222, 240))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Button, QColor(51, 55, 62))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Button, QColor(59, 63, 71))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Button, QColor(59, 63, 71))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.ButtonText, QColor(98, 104, 114))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.ButtonText, QColor(210, 222, 240))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.ButtonText, QColor(210, 222, 240))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.BrightText, QColor(255, 255, 255))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Light, QColor(59, 64, 72))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Light, QColor(63, 68, 76))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Light, QColor(63, 68, 76))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Midlight, QColor(48, 52, 59))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Midlight, QColor(51, 56, 63))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Midlight, QColor(51, 56, 63))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Dark, QColor(18, 19, 22))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Dark, QColor(20, 22, 25))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Dark, QColor(20, 22, 25))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Mid, QColor(28, 30, 34))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Mid, QColor(32, 35, 39))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Mid, QColor(32, 35, 39))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Shadow, QColor(13, 14, 16))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Shadow, QColor(15, 16, 18))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Shadow, QColor(15, 16, 18))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Highlight, QColor(32, 35, 39))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Highlight, QColor(14, 14, 17))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Highlight, QColor(27, 28, 33))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.HighlightedText, QColor(89, 95, 104))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.HighlightedText, QColor(217, 234, 253))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.HighlightedText, QColor(223, 237, 255))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.Link, QColor(79, 100, 118))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.Link, QColor(156, 212, 255))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.Link, QColor(156, 212, 255))
-            self.fPalBlue.setColor(QPalette.Disabled, QPalette.LinkVisited, QColor(51, 74, 118))
-            self.fPalBlue.setColor(QPalette.Active,   QPalette.LinkVisited, QColor(64, 128, 255))
-            self.fPalBlue.setColor(QPalette.Inactive, QPalette.LinkVisited, QColor(64, 128, 255))
-            self.fApp.setPalette(self.fPalBlue)
+            self.createPaletteBlue()
 
     def createApp(self, appName):
         if LINUX:
@@ -246,6 +152,128 @@ class CarlaApplication(object):
                 self.fApp.setDesktopFileName("carla")
             self.fApp.setWindowIcon(QIcon(":/scalable/carla.svg"))
 
+    def createPaletteBlack(self):
+        self.fPalBlack = QPalette()
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Window, QColor(14, 14, 14))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Window, QColor(17, 17, 17))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Window, QColor(17, 17, 17))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.WindowText, QColor(83, 83, 83))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.WindowText, QColor(240, 240, 240))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.WindowText, QColor(240, 240, 240))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Base, QColor(6, 6, 6))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Base, QColor(7, 7, 7))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Base, QColor(7, 7, 7))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.AlternateBase, QColor(12, 12, 12))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.AlternateBase, QColor(14, 14, 14))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.AlternateBase, QColor(14, 14, 14))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.ToolTipBase, QColor(4, 4, 4))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.ToolTipBase, QColor(4, 4, 4))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.ToolTipBase, QColor(4, 4, 4))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.ToolTipText, QColor(230, 230, 230))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.ToolTipText, QColor(230, 230, 230))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.ToolTipText, QColor(230, 230, 230))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Text, QColor(74, 74, 74))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Text, QColor(230, 230, 230))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Text, QColor(230, 230, 230))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Button, QColor(24, 24, 24))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Button, QColor(28, 28, 28))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Button, QColor(28, 28, 28))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.ButtonText, QColor(90, 90, 90))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.ButtonText, QColor(240, 240, 240))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.ButtonText, QColor(240, 240, 240))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Light, QColor(191, 191, 191))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Light, QColor(191, 191, 191))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Light, QColor(191, 191, 191))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Midlight, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Midlight, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Midlight, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Dark, QColor(129, 129, 129))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Dark, QColor(129, 129, 129))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Dark, QColor(129, 129, 129))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Mid, QColor(94, 94, 94))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Mid, QColor(94, 94, 94))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Mid, QColor(94, 94, 94))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Shadow, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Shadow, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Shadow, QColor(155, 155, 155))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Highlight, QColor(14, 14, 14))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Highlight, QColor(60, 60, 60))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Highlight, QColor(34, 34, 34))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.HighlightedText, QColor(83, 83, 83))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.HighlightedText, QColor(255, 255, 255))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.HighlightedText, QColor(240, 240, 240))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.Link, QColor(34, 34, 74))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.Link, QColor(100, 100, 230))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.Link, QColor(100, 100, 230))
+        self.fPalBlack.setColor(QPalette.Disabled, QPalette.LinkVisited, QColor(74, 34, 74))
+        self.fPalBlack.setColor(QPalette.Active,   QPalette.LinkVisited, QColor(230, 100, 230))
+        self.fPalBlack.setColor(QPalette.Inactive, QPalette.LinkVisited, QColor(230, 100, 230))
+        self.fApp.setPalette(self.fPalBlack)
+
+    def createPaletteBlue(self):
+        self.fPalBlue = QPalette()
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Window, QColor(32, 35, 39))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Window, QColor(37, 40, 45))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Window, QColor(37, 40, 45))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.WindowText, QColor(89, 95, 104))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.WindowText, QColor(223, 237, 255))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.WindowText, QColor(223, 237, 255))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Base, QColor(48, 53, 60))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Base, QColor(55, 61, 69))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Base, QColor(55, 61, 69))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.AlternateBase, QColor(60, 64, 67))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.AlternateBase, QColor(69, 73, 77))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.AlternateBase, QColor(69, 73, 77))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.ToolTipBase, QColor(182, 193, 208))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.ToolTipBase, QColor(182, 193, 208))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.ToolTipBase, QColor(182, 193, 208))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.ToolTipText, QColor(42, 44, 48))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.ToolTipText, QColor(42, 44, 48))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.ToolTipText, QColor(42, 44, 48))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Text, QColor(96, 103, 113))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Text, QColor(210, 222, 240))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Text, QColor(210, 222, 240))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Button, QColor(51, 55, 62))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Button, QColor(59, 63, 71))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Button, QColor(59, 63, 71))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.ButtonText, QColor(98, 104, 114))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.ButtonText, QColor(210, 222, 240))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.ButtonText, QColor(210, 222, 240))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.BrightText, QColor(255, 255, 255))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Light, QColor(59, 64, 72))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Light, QColor(63, 68, 76))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Light, QColor(63, 68, 76))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Midlight, QColor(48, 52, 59))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Midlight, QColor(51, 56, 63))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Midlight, QColor(51, 56, 63))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Dark, QColor(18, 19, 22))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Dark, QColor(20, 22, 25))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Dark, QColor(20, 22, 25))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Mid, QColor(28, 30, 34))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Mid, QColor(32, 35, 39))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Mid, QColor(32, 35, 39))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Shadow, QColor(13, 14, 16))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Shadow, QColor(15, 16, 18))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Shadow, QColor(15, 16, 18))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Highlight, QColor(32, 35, 39))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Highlight, QColor(14, 14, 17))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Highlight, QColor(27, 28, 33))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.HighlightedText, QColor(89, 95, 104))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.HighlightedText, QColor(217, 234, 253))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.HighlightedText, QColor(223, 237, 255))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.Link, QColor(79, 100, 118))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.Link, QColor(156, 212, 255))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.Link, QColor(156, 212, 255))
+        self.fPalBlue.setColor(QPalette.Disabled, QPalette.LinkVisited, QColor(51, 74, 118))
+        self.fPalBlue.setColor(QPalette.Active,   QPalette.LinkVisited, QColor(64, 128, 255))
+        self.fPalBlue.setColor(QPalette.Inactive, QPalette.LinkVisited, QColor(64, 128, 255))
+        self.fApp.setPalette(self.fPalBlue)
+
     def exec_(self):
         return self.fApp.exec_()
 
diff --git a/source/frontend/carla_backend.py b/source/frontend/carla_backend.py
index 3bc475ffe..bfa844785 100644
--- a/source/frontend/carla_backend.py
+++ b/source/frontend/carla_backend.py
@@ -20,11 +20,20 @@
 # Imports (Global)
 
 from abc import abstractmethod
-from ctypes import *
 from platform import architecture
 from struct import pack
 from sys import platform, maxsize
 
+# ------------------------------------------------------------------------------------------------------------
+# Imports (ctypes)
+
+from ctypes import (
+    c_bool, c_char_p, c_double, c_float, c_int, c_long, c_longdouble, c_longlong, c_ubyte, c_uint, c_void_p,
+    c_int8, c_int16, c_int32, c_int64, c_uint8, c_uint16, c_uint32, c_uint64,
+    cast, Structure,
+    CDLL, CFUNCTYPE, RTLD_GLOBAL, RTLD_LOCAL, POINTER
+)
+
 # ------------------------------------------------------------------------------------------------------------
 # 64bit check
 
@@ -126,8 +135,10 @@ def toPythonType(value, attr):
         return value
     if isinstance(value, bytes):
         return charPtrToString(value)
+    # pylint: disable=consider-merging-isinstance
     if isinstance(value, c_intp_types) or isinstance(value, c_floatp_types):
         return numPtrToList(value)
+    # pylint: enable=consider-merging-isinstance
     if isinstance(value, POINTER(c_char_p)):
         return charPtrPtrToStringList(value)
     print("..............", attr, ".....................", value, ":", type(value))
@@ -137,7 +148,9 @@ def toPythonType(value, attr):
 # Convert a ctypes struct into a python dict
 
 def structToDict(struct):
+    # pylint: disable=protected-access
     return dict((attr, toPythonType(getattr(struct, attr), attr)) for attr, value in struct._fields_)
+    # pylint: enable=protected-access
 
 # ------------------------------------------------------------------------------------------------------------
 # Carla Backend API (base definitions)
@@ -2877,6 +2890,9 @@ class CarlaHostDLL(CarlaHostMeta):
 
         self.handle = self.lib.carla_standalone_host_init()
 
+        self._engineCallback = None
+        self._fileCallback = None
+
     # --------------------------------------------------------------------------------------------------------
 
     def get_engine_driver_count(self):
@@ -3647,8 +3663,8 @@ class CarlaHostPlugin(CarlaHostMeta):
         if pluginId < len(self.fPluginsInfo):
             return
 
-        for id in range(len(self.fPluginsInfo), pluginId+1):
-            self.fPluginsInfo[id] = PluginStoreInfo()
+        for pid in range(len(self.fPluginsInfo), pluginId+1):
+            self.fPluginsInfo[pid] = PluginStoreInfo()
 
     def _set_pluginInfo(self, pluginId, info):
         plugin = self.fPluginsInfo.get(pluginId, None)
@@ -3718,7 +3734,7 @@ class CarlaHostPlugin(CarlaHostMeta):
         plugin.parameterValues = []
 
         # add placeholders
-        for x in range(count):
+        for _ in range(count):
             plugin.parameterInfo.append(PyCarlaParameterInfo.copy())
             plugin.parameterData.append(PyParameterData.copy())
             plugin.parameterRanges.append(PyParameterRanges.copy())
@@ -3731,7 +3747,7 @@ class CarlaHostPlugin(CarlaHostMeta):
             return
 
         plugin.programCount = count
-        plugin.programNames = ["" for x in range(count)]
+        plugin.programNames = ["" for _ in range(count)]
 
     def _set_midiProgramCount(self, pluginId, count):
         plugin = self.fPluginsInfo.get(pluginId, None)
@@ -3740,7 +3756,7 @@ class CarlaHostPlugin(CarlaHostMeta):
             return
 
         plugin.midiProgramCount = count
-        plugin.midiProgramData = [PyMidiProgramData.copy() for x in range(count)]
+        plugin.midiProgramData = [PyMidiProgramData.copy() for _ in range(count)]
 
     def _set_customDataCount(self, pluginId, count):
         plugin = self.fPluginsInfo.get(pluginId, None)
@@ -3749,7 +3765,7 @@ class CarlaHostPlugin(CarlaHostMeta):
             return
 
         plugin.customDataCount = count
-        plugin.customData = [PyCustomData.copy() for x in range(count)]
+        plugin.customData = [PyCustomData.copy() for _ in range(count)]
 
     def _set_parameterInfo(self, pluginId, paramIndex, info):
         plugin = self.fPluginsInfo.get(pluginId, None)
diff --git a/source/frontend/carla_backend_qt.py b/source/frontend/carla_backend_qt.py
index 152b29fa8..86bfe26f0 100644
--- a/source/frontend/carla_backend_qt.py
+++ b/source/frontend/carla_backend_qt.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 # Carla Backend code (Qt stuff)
-# Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+# Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -24,7 +24,7 @@ from PyQt5.QtCore import pyqtSignal, QObject
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
 
-from carla_backend import *
+from carla_backend import CarlaHostNull, CarlaHostDLL, CarlaHostPlugin
 
 # ------------------------------------------------------------------------------------------------------------
 # Carla Host PyQt signals
@@ -98,9 +98,11 @@ class CarlaHostQtDLL(CarlaHostDLL, CarlaHostSignals):
 # ------------------------------------------------------------------------------------------------------------
 # Carla Host object for plugins (using pipes)
 
+# pylint: disable=abstract-method
 class CarlaHostQtPlugin(CarlaHostPlugin, CarlaHostSignals):
     def __init__(self):
         CarlaHostSignals.__init__(self)
         CarlaHostPlugin.__init__(self)
 
+# pylint: enable=abstract-method
 # ------------------------------------------------------------------------------------------------------------
diff --git a/source/frontend/carla_control.py b/source/frontend/carla_control.py
index a7f777be8..299975e9d 100755
--- a/source/frontend/carla_control.py
+++ b/source/frontend/carla_control.py
@@ -26,6 +26,7 @@ from PyQt5.QtCore import QEventLoop
 
 import ui_carla_osc_connect
 
+from carla_backend_qt import CarlaHostQtPlugin
 from carla_host import *
 
 # ------------------------------------------------------------------------------------------------------------
@@ -104,10 +105,10 @@ class ConnectDialog(QDialog):
             self.ui.rb_reported_auto.setChecked(False)
             self.ui.rb_reported_custom.setChecked(True)
 
-        self.ui.le_host.setText(settings.value("Host", "127.0.0.1", type=str))
-        self.ui.le_reported_host.setText(settings.value("ReportedHost", "", type=str))
-        self.ui.sb_tcp_port.setValue(settings.value("TCPPort", CARLA_DEFAULT_OSC_TCP_PORT_NUMBER, type=int))
-        self.ui.sb_udp_port.setValue(settings.value("UDPPort", CARLA_DEFAULT_OSC_UDP_PORT_NUMBER, type=int))
+        self.ui.le_host.setText(settings.value("Host", "127.0.0.1", str))
+        self.ui.le_reported_host.setText(settings.value("ReportedHost", "", str))
+        self.ui.sb_tcp_port.setValue(settings.value("TCPPort", CARLA_DEFAULT_OSC_TCP_PORT_NUMBER, int))
+        self.ui.sb_udp_port.setValue(settings.value("UDPPort", CARLA_DEFAULT_OSC_UDP_PORT_NUMBER, int))
 
         self.checkIfButtonBoxShouldBeEnabled(self.ui.le_host.text(),
                                              self.ui.rb_reported_auto.isChecked(),
@@ -717,9 +718,9 @@ class HostWindowOSC(HostWindow):
     def loadSettings(self, firstTime):
         settings = HostWindow.loadSettings(self, firstTime)
         if self.fCustomOscAddress is not None:
-            self.fOscAddressTCP = settings.value("RemoteAddressTCP", "osc.tcp://127.0.0.1:22752/Carla", type=str)
-            self.fOscAddressUDP = settings.value("RemoteAddressUDP", "osc.udp://127.0.0.1:22752/Carla", type=str)
-            self.fOscReportedHost = settings.value("RemoteReportedHost", "", type=str)
+            self.fOscAddressTCP = settings.value("RemoteAddressTCP", "osc.tcp://127.0.0.1:22752/Carla", str)
+            self.fOscAddressUDP = settings.value("RemoteAddressUDP", "osc.udp://127.0.0.1:22752/Carla", str)
+            self.fOscReportedHost = settings.value("RemoteReportedHost", "", str)
 
     def saveSettings(self):
         settings = HostWindow.saveSettings(self)
diff --git a/source/frontend/carla_database.py b/source/frontend/carla_database.py
index 806e29357..26c343f1b 100755
--- a/source/frontend/carla_database.py
+++ b/source/frontend/carla_database.py
@@ -33,6 +33,7 @@ import ui_carla_add_jack
 import ui_carla_database
 import ui_carla_refresh
 
+from carla_backend import *
 from carla_shared import *
 from carla_utils import getPluginTypeAsString, getPluginCategoryAsString
 
@@ -1006,10 +1007,6 @@ class PluginRefreshW(QDialog):
         self.ui = ui_carla_refresh.Ui_PluginRefreshW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            self.host = host = CarlaHostNull()
-
         # -------------------------------------------------------------------------------------------------------------
         # Internal stuff
 
@@ -1378,12 +1375,6 @@ class PluginRefreshW(QDialog):
 
         QDialog.closeEvent(self, event)
 
-    # -----------------------------------------------------------------------------------------------------------------
-
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ---------------------------------------------------------------------------------------------------------------------
 # Plugin Database Dialog
 
@@ -1400,11 +1391,6 @@ class PluginDatabaseW(QDialog):
         self.ui = ui_carla_database.Ui_PluginDatabaseW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         # ----------------------------------------------------------------------------------------------------
         # Internal stuff
 
@@ -2218,10 +2204,6 @@ class PluginDatabaseW(QDialog):
         self.ui.lineEdit.setFocus()
         QDialog.showEvent(self, event)
 
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ---------------------------------------------------------------------------------------------------------------------
 # Jack Application Dialog
 
@@ -2374,24 +2356,21 @@ class JackApplicationW(QDialog):
         settings.setValue("CaptureFirstWindow", self.ui.cb_capture_first_window.isChecked())
         settings.setValue("MidiOutMixdown", self.ui.cb_out_midi_mixdown.isChecked())
 
-    # -----------------------------------------------------------------------------------------------------------------
-
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ---------------------------------------------------------------------------------------------------------------------
 # Main
 
 if __name__ == '__main__':
     from carla_app import CarlaApplication
-    from carla_host import initHost, loadHostSettings
+    from carla_host import initHost as _initHost, loadHostSettings as _loadHostSettings
+    # pylint: disable=ungrouped-imports
+    from carla_shared import handleInitialCommandLineArguments
+    # pylint: enable=ungrouped-imports
 
     initName, libPrefix = handleInitialCommandLineArguments(__file__ if "__file__" in dir() else None)
 
     app  = CarlaApplication("Carla2-Database", libPrefix)
-    host = initHost("Carla2-Database", libPrefix, False, False, False)
-    loadHostSettings(host)
+    host = _initHost("Carla2-Database", libPrefix, False, False, False)
+    _loadHostSettings(host)
 
     gui = PluginDatabaseW(None, host)
     gui.show()
diff --git a/source/frontend/carla_host.py b/source/frontend/carla_host.py
index 3b291764c..2ce90ebdb 100644
--- a/source/frontend/carla_host.py
+++ b/source/frontend/carla_host.py
@@ -21,6 +21,16 @@
 
 import json
 
+# ------------------------------------------------------------------------------------------------------------
+# Imports (ctypes)
+
+from ctypes import (
+    byref, pointer
+)
+
+# ------------------------------------------------------------------------------------------------------------
+# Imports (PyQt5)
+
 # This fails in some configurations, assume >= 5.6.0 in that case
 try:
     from PyQt5.Qt import PYQT_VERSION
@@ -28,7 +38,7 @@ except ImportError:
     PYQT_VERSION = 0x50600
 
 from PyQt5.QtCore import QT_VERSION, qCritical, QEventLoop, QFileInfo, QModelIndex, QPointF, QTimer, QEvent
-from PyQt5.QtGui import QImage, QImageWriter, QPalette, QBrush
+from PyQt5.QtGui import QImage, QImageWriter, QPainter, QPalette, QBrush
 from PyQt5.QtWidgets import QAction, QApplication, QInputDialog, QFileSystemModel, QListWidgetItem, QGraphicsView, QMainWindow
 
 # ------------------------------------------------------------------------------------------------------------
@@ -37,6 +47,7 @@ from PyQt5.QtWidgets import QAction, QApplication, QInputDialog, QFileSystemMode
 import ui_carla_host
 
 from carla_app import *
+from carla_backend_qt import CarlaHostQtDLL, CarlaHostQtNull
 from carla_database import *
 from carla_settings import *
 from carla_utils import *
@@ -3332,7 +3343,7 @@ def runHostWithoutUI(host):
 
     if not isinstance(gCarla.nogui, int):
         oscPort = None
-        projectFile = getInitialProjectFile(QCoreApplication.instance(), True)
+        projectFile = getInitialProjectFile(True)
 
         if not projectFile:
             print("Carla no-gui mode can only be used together with a project file.")
diff --git a/source/frontend/carla_settings.py b/source/frontend/carla_settings.py
index 806735c00..7a6b2e479 100755
--- a/source/frontend/carla_settings.py
+++ b/source/frontend/carla_settings.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 # Carla settings code
-# Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+# Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -17,11 +17,10 @@
 # For a full copy of the GNU General Public License see the doc/GPL.txt file.
 
 # ------------------------------------------------------------------------------------------------------------
-# Imports (Global)
+# Imports (PyQt5)
 
-from PyQt5.QtCore import pyqtSlot, QByteArray, QDir
-from PyQt5.QtGui import QColor, QCursor, QPainter, QPainterPath
-from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QFrame, QInputDialog, QLineEdit, QMenu, QVBoxLayout, QWidget
+from PyQt5.QtCore import pyqtSlot, Qt
+from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QFileDialog
 
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
@@ -29,8 +28,152 @@ from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QFrame, QInputDialog, QLi
 import ui_carla_settings
 import ui_carla_settings_driver
 
-from carla_shared import *
-from patchcanvas.theme import *
+from carla_backend import (
+    LINUX, MACOS, WINDOWS,
+    ENGINE_DRIVER_DEVICE_HAS_CONTROL_PANEL,
+    ENGINE_DRIVER_DEVICE_CAN_TRIPLE_BUFFER,
+    ENGINE_DRIVER_DEVICE_VARIABLE_BUFFER_SIZE,
+    ENGINE_DRIVER_DEVICE_VARIABLE_SAMPLE_RATE,
+    ENGINE_PROCESS_MODE_CONTINUOUS_RACK,
+    ENGINE_OPTION_FILE_PATH,
+    ENGINE_OPTION_PLUGIN_PATH,
+    FILE_AUDIO,
+    FILE_MIDI,
+    PLUGIN_LADSPA,
+    PLUGIN_DSSI,
+    PLUGIN_LV2,
+    PLUGIN_VST2,
+    PLUGIN_VST3,
+    PLUGIN_SF2,
+    PLUGIN_SFZ
+)
+
+from carla_shared import (
+    CARLA_KEY_MAIN_PROJECT_FOLDER,
+    CARLA_KEY_MAIN_USE_PRO_THEME,
+    CARLA_KEY_MAIN_PRO_THEME_COLOR,
+    CARLA_KEY_MAIN_REFRESH_INTERVAL,
+    CARLA_KEY_MAIN_CONFIRM_EXIT,
+    CARLA_KEY_MAIN_SHOW_LOGS,
+    CARLA_KEY_MAIN_EXPERIMENTAL,
+    CARLA_KEY_CANVAS_THEME,
+    CARLA_KEY_CANVAS_SIZE,
+    CARLA_KEY_CANVAS_USE_BEZIER_LINES,
+    CARLA_KEY_CANVAS_AUTO_HIDE_GROUPS,
+    CARLA_KEY_CANVAS_AUTO_SELECT_ITEMS,
+    #CARLA_KEY_CANVAS_EYE_CANDY,
+    CARLA_KEY_CANVAS_FANCY_EYE_CANDY,
+    CARLA_KEY_CANVAS_USE_OPENGL,
+    CARLA_KEY_CANVAS_ANTIALIASING,
+    CARLA_KEY_CANVAS_HQ_ANTIALIASING,
+    CARLA_KEY_CANVAS_INLINE_DISPLAYS,
+    CARLA_KEY_CANVAS_FULL_REPAINTS,
+    CARLA_KEY_ENGINE_DRIVER_PREFIX,
+    CARLA_KEY_ENGINE_AUDIO_DRIVER,
+    CARLA_KEY_ENGINE_PROCESS_MODE,
+    CARLA_KEY_ENGINE_FORCE_STEREO,
+    CARLA_KEY_ENGINE_PREFER_PLUGIN_BRIDGES,
+    CARLA_KEY_ENGINE_PREFER_UI_BRIDGES,
+    CARLA_KEY_ENGINE_MANAGE_UIS,
+    CARLA_KEY_ENGINE_UIS_ALWAYS_ON_TOP,
+    CARLA_KEY_ENGINE_MAX_PARAMETERS,
+    CARLA_KEY_ENGINE_RESET_XRUNS,
+    CARLA_KEY_ENGINE_UI_BRIDGES_TIMEOUT,
+    CARLA_KEY_OSC_ENABLED,
+    CARLA_KEY_OSC_TCP_PORT_ENABLED,
+    CARLA_KEY_OSC_TCP_PORT_NUMBER,
+    CARLA_KEY_OSC_TCP_PORT_RANDOM,
+    CARLA_KEY_OSC_UDP_PORT_ENABLED,
+    CARLA_KEY_OSC_UDP_PORT_NUMBER,
+    CARLA_KEY_OSC_UDP_PORT_RANDOM,
+    CARLA_KEY_PATHS_AUDIO,
+    CARLA_KEY_PATHS_MIDI,
+    CARLA_KEY_PATHS_LADSPA,
+    CARLA_KEY_PATHS_DSSI,
+    CARLA_KEY_PATHS_LV2,
+    CARLA_KEY_PATHS_VST2,
+    CARLA_KEY_PATHS_VST3,
+    CARLA_KEY_PATHS_SF2,
+    CARLA_KEY_PATHS_SFZ,
+    CARLA_KEY_WINE_EXECUTABLE,
+    CARLA_KEY_WINE_AUTO_PREFIX,
+    CARLA_KEY_WINE_FALLBACK_PREFIX,
+    CARLA_KEY_WINE_RT_PRIO_ENABLED,
+    CARLA_KEY_WINE_BASE_RT_PRIO,
+    CARLA_KEY_WINE_SERVER_RT_PRIO,
+    CARLA_KEY_EXPERIMENTAL_PLUGIN_BRIDGES,
+    CARLA_KEY_EXPERIMENTAL_WINE_BRIDGES,
+    CARLA_KEY_EXPERIMENTAL_JACK_APPS,
+    CARLA_KEY_EXPERIMENTAL_EXPORT_LV2,
+    CARLA_KEY_EXPERIMENTAL_PREVENT_BAD_BEHAVIOUR,
+    CARLA_KEY_EXPERIMENTAL_LOAD_LIB_GLOBAL,
+    CARLA_DEFAULT_MAIN_PROJECT_FOLDER,
+    CARLA_DEFAULT_MAIN_USE_PRO_THEME,
+    CARLA_DEFAULT_MAIN_PRO_THEME_COLOR,
+    CARLA_DEFAULT_MAIN_REFRESH_INTERVAL,
+    CARLA_DEFAULT_MAIN_CONFIRM_EXIT,
+    CARLA_DEFAULT_MAIN_SHOW_LOGS,
+    #CARLA_DEFAULT_MAIN_EXPERIMENTAL,
+    CARLA_DEFAULT_CANVAS_THEME,
+    CARLA_DEFAULT_CANVAS_SIZE,
+    CARLA_DEFAULT_CANVAS_USE_BEZIER_LINES,
+    CARLA_DEFAULT_CANVAS_AUTO_HIDE_GROUPS,
+    CARLA_DEFAULT_CANVAS_AUTO_SELECT_ITEMS,
+    #CARLA_DEFAULT_CANVAS_EYE_CANDY,
+    CARLA_DEFAULT_CANVAS_FANCY_EYE_CANDY,
+    CARLA_DEFAULT_CANVAS_USE_OPENGL,
+    CARLA_DEFAULT_CANVAS_ANTIALIASING,
+    CARLA_DEFAULT_CANVAS_HQ_ANTIALIASING,
+    CARLA_DEFAULT_CANVAS_INLINE_DISPLAYS,
+    CARLA_DEFAULT_CANVAS_FULL_REPAINTS,
+    CARLA_DEFAULT_FORCE_STEREO,
+    CARLA_DEFAULT_PREFER_PLUGIN_BRIDGES,
+    CARLA_DEFAULT_PREFER_UI_BRIDGES,
+    CARLA_DEFAULT_MANAGE_UIS,
+    CARLA_DEFAULT_UIS_ALWAYS_ON_TOP,
+    CARLA_DEFAULT_MAX_PARAMETERS,
+    CARLA_DEFAULT_RESET_XRUNS,
+    CARLA_DEFAULT_UI_BRIDGES_TIMEOUT,
+    CARLA_DEFAULT_AUDIO_BUFFER_SIZE,
+    CARLA_DEFAULT_AUDIO_SAMPLE_RATE,
+    CARLA_DEFAULT_AUDIO_TRIPLE_BUFFER,
+    CARLA_DEFAULT_AUDIO_DRIVER,
+    CARLA_DEFAULT_PROCESS_MODE,
+    CARLA_DEFAULT_OSC_ENABLED,
+    CARLA_DEFAULT_OSC_TCP_PORT_ENABLED,
+    CARLA_DEFAULT_OSC_TCP_PORT_NUMBER,
+    CARLA_DEFAULT_OSC_TCP_PORT_RANDOM,
+    CARLA_DEFAULT_OSC_UDP_PORT_ENABLED,
+    CARLA_DEFAULT_OSC_UDP_PORT_NUMBER,
+    CARLA_DEFAULT_OSC_UDP_PORT_RANDOM,
+    CARLA_DEFAULT_WINE_EXECUTABLE,
+    CARLA_DEFAULT_WINE_AUTO_PREFIX,
+    CARLA_DEFAULT_WINE_FALLBACK_PREFIX,
+    CARLA_DEFAULT_WINE_RT_PRIO_ENABLED,
+    CARLA_DEFAULT_WINE_BASE_RT_PRIO,
+    CARLA_DEFAULT_WINE_SERVER_RT_PRIO,
+    CARLA_DEFAULT_EXPERIMENTAL_PLUGIN_BRIDGES,
+    CARLA_DEFAULT_EXPERIMENTAL_WINE_BRIDGES,
+    CARLA_DEFAULT_EXPERIMENTAL_JACK_APPS,
+    CARLA_DEFAULT_EXPERIMENTAL_LV2_EXPORT,
+    CARLA_DEFAULT_EXPERIMENTAL_PREVENT_BAD_BEHAVIOUR,
+    CARLA_DEFAULT_EXPERIMENTAL_LOAD_LIB_GLOBAL,
+    CARLA_DEFAULT_FILE_PATH_AUDIO,
+    CARLA_DEFAULT_FILE_PATH_MIDI,
+    CARLA_DEFAULT_LADSPA_PATH,
+    CARLA_DEFAULT_DSSI_PATH,
+    CARLA_DEFAULT_LV2_PATH,
+    CARLA_DEFAULT_VST2_PATH,
+    CARLA_DEFAULT_VST3_PATH,
+    CARLA_DEFAULT_SF2_PATH,
+    CARLA_DEFAULT_SFZ_PATH,
+    getAndSetPath,
+    fontMetricsHorizontalAdvance,
+    splitter,
+    QSafeSettings
+)
+
+from patchcanvas.theme import Theme, getThemeName
 
 # ------------------------------------------------------------------------------------------------------------
 # ...
@@ -50,11 +193,6 @@ class DriverSettingsW(QDialog):
         self.ui = ui_carla_settings_driver.Ui_DriverSettingsW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         # ----------------------------------------------------------------------------------------------------
         # Internal stuff
 
@@ -169,7 +307,7 @@ class DriverSettingsW(QDialog):
         else:
             self.ui.b_panel.setEnabled(False)
 
-        if len(self.fBufferSizes) > 0:
+        if self.fBufferSizes:
             for bsize in self.fBufferSizes:
                 sbsize = str(bsize)
                 self.ui.cb_buffersize.addItem(sbsize)
@@ -181,7 +319,7 @@ class DriverSettingsW(QDialog):
             self.ui.cb_buffersize.addItem(self.AUTOMATIC_OPTION)
             self.ui.cb_buffersize.setCurrentIndex(0)
 
-        if len(self.fSampleRates) > 0:
+        if self.fSampleRates:
             for srate in self.fSampleRates:
                 ssrate = str(int(srate))
                 self.ui.cb_samplerate.addItem(ssrate)
@@ -193,12 +331,6 @@ class DriverSettingsW(QDialog):
             self.ui.cb_samplerate.addItem(self.AUTOMATIC_OPTION)
             self.ui.cb_samplerate.setCurrentIndex(0)
 
-    # --------------------------------------------------------------------------------------------------------
-
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # Runtime Driver Settings
 
@@ -209,11 +341,6 @@ class RuntimeDriverSettingsW(QDialog):
         self.ui = ui_carla_settings_driver.Ui_DriverSettingsW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         driverDeviceInfo = host.get_runtime_engine_driver_device_info()
 
         # ----------------------------------------------------------------------------------------------------
@@ -251,7 +378,7 @@ class RuntimeDriverSettingsW(QDialog):
             self.ui.cb_device.addItem(driverDeviceInfo['name'])
             self.ui.cb_device.setCurrentIndex(0)
 
-        if len(driverDeviceInfo['bufferSizes']) > 0:
+        if driverDeviceInfo['bufferSizes']:
             for bsize in driverDeviceInfo['bufferSizes']:
                 sbsize = str(bsize)
                 self.ui.cb_buffersize.addItem(sbsize)
@@ -266,7 +393,7 @@ class RuntimeDriverSettingsW(QDialog):
         if (driverDeviceInfo['hints'] & ENGINE_DRIVER_DEVICE_VARIABLE_BUFFER_SIZE) == 0x0:
             self.ui.cb_buffersize.setEnabled(False)
 
-        if len(driverDeviceInfo['sampleRates']) > 0:
+        if driverDeviceInfo['sampleRates']:
             for srate in driverDeviceInfo['sampleRates']:
                 ssrate = str(int(srate))
                 self.ui.cb_samplerate.addItem(ssrate)
@@ -309,12 +436,6 @@ class RuntimeDriverSettingsW(QDialog):
     def slot_showDevicePanel(self):
         self.host.show_engine_device_control_panel()
 
-    # --------------------------------------------------------------------------------------------------------
-
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # Settings Dialog
 
@@ -356,11 +477,6 @@ class CarlaSettingsW(QDialog):
         self.ui = ui_carla_settings.Ui_CarlaSettingsW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         # ----------------------------------------------------------------------------------------------------
         # Set-up GUI
 
@@ -636,11 +752,13 @@ class CarlaSettingsW(QDialog):
         midiPaths.sort()
 
         for audioPath in audioPaths:
-            if not audioPath: continue
+            if not audioPath:
+                continue
             self.ui.lw_files_audio.addItem(audioPath)
 
         for midiPath in midiPaths:
-            if not midiPath: continue
+            if not midiPath:
+                continue
             self.ui.lw_files_midi.addItem(midiPath)
 
         # ----------------------------------------------------------------------------------------------------
@@ -663,31 +781,38 @@ class CarlaSettingsW(QDialog):
         sfzs.sort()
 
         for ladspa in ladspas:
-            if not ladspa: continue
+            if not ladspa:
+                continue
             self.ui.lw_ladspa.addItem(ladspa)
 
         for dssi in dssis:
-            if not dssi: continue
+            if not dssi:
+                continue
             self.ui.lw_dssi.addItem(dssi)
 
         for lv2 in lv2s:
-            if not lv2: continue
+            if not lv2:
+                continue
             self.ui.lw_lv2.addItem(lv2)
 
         for vst2 in vst2s:
-            if not vst2: continue
+            if not vst2:
+                continue
             self.ui.lw_vst.addItem(vst2)
 
         for vst3 in vst3s:
-            if not vst3: continue
+            if not vst3:
+                continue
             self.ui.lw_vst3.addItem(vst3)
 
         for sf2 in sf2s:
-            if not sf2: continue
+            if not sf2:
+                continue
             self.ui.lw_sf2.addItem(sf2)
 
         for sfz in sfzs:
-            if not sfz: continue
+            if not sfz:
+                continue
             self.ui.lw_sfz.addItem(sfz)
 
         # ----------------------------------------------------------------------------------------------------
@@ -699,7 +824,7 @@ class CarlaSettingsW(QDialog):
 
         self.ui.cb_wine_prefix_detect.setChecked(settings.value(CARLA_KEY_WINE_AUTO_PREFIX,
                                                                 CARLA_DEFAULT_WINE_AUTO_PREFIX,
-                                                                 bool))
+                                                                bool))
 
         self.ui.le_wine_prefix_fallback.setText(settings.value(CARLA_KEY_WINE_FALLBACK_PREFIX,
                                                                CARLA_DEFAULT_WINE_FALLBACK_PREFIX,
@@ -1020,7 +1145,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_ladspa.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_ladspa.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_DSSI:
@@ -1029,7 +1155,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_dssi.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_dssi.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_LV2:
@@ -1038,7 +1165,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_lv2.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_lv2.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_VST2:
@@ -1047,7 +1175,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_vst.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_vst.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_VST3:
@@ -1056,7 +1185,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_vst3.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_vst3.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_SF2:
@@ -1065,7 +1195,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_sf2.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_sf2.addItem(path)
 
             elif curIndex == self.PLUGINPATH_INDEX_SFZ:
@@ -1074,7 +1205,8 @@ class CarlaSettingsW(QDialog):
                 self.ui.lw_sfz.clear()
 
                 for path in paths:
-                    if not path: continue
+                    if not path:
+                        continue
                     self.ui.lw_sfz.addItem(path)
 
         # ----------------------------------------------------------------------------------------------------
@@ -1357,28 +1489,25 @@ class CarlaSettingsW(QDialog):
         self.ui.b_filepaths_remove.setEnabled(check)
         self.ui.b_filepaths_change.setEnabled(check)
 
-    # --------------------------------------------------------------------------------------------------------
-
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # Main
 
 if __name__ == '__main__':
     from carla_app import CarlaApplication
-    from carla_host import initHost, loadHostSettings
+    from carla_host import initHost as _initHost, loadHostSettings as _loadHostSettings
+    # pylint: disable=ungrouped-imports
+    from carla_shared import handleInitialCommandLineArguments
+    # pylint: enable=ungrouped-imports
 
     initName, libPrefix = handleInitialCommandLineArguments(__file__ if "__file__" in dir() else None)
 
-    app  = CarlaApplication("Carla2-Settings", libPrefix)
-    host = initHost("Carla2-Settings", libPrefix, False, False, False)
-    loadHostSettings(host)
+    _app  = CarlaApplication("Carla2-Settings", libPrefix)
+    _host = _initHost("Carla2-Settings", libPrefix, False, False, False)
+    _loadHostSettings(_host)
 
-    gui = CarlaSettingsW(None, host, True, True)
-    gui.show()
+    _gui = CarlaSettingsW(None, _host, True, True)
+    _gui.show()
 
-    app.exit_exec()
+    _app.exit_exec()
 
 # ------------------------------------------------------------------------------------------------------------
diff --git a/source/frontend/carla_shared.py b/source/frontend/carla_shared.py
index 96db4be2d..b36c75a66 100644
--- a/source/frontend/carla_shared.py
+++ b/source/frontend/carla_shared.py
@@ -31,13 +31,8 @@ import sys
 
 from math import fmod
 
-from PyQt5.Qt import PYQT_VERSION_STR
-from PyQt5.QtCore import qFatal, QT_VERSION, QT_VERSION_STR, qWarning, QDir, QSettings
-from PyQt5.QtGui import QIcon
-from PyQt5.QtWidgets import QFileDialog, QMessageBox
-
 # ------------------------------------------------------------------------------------------------------------
-# Import Signal
+# Imports (Signal)
 
 from signal import signal, SIGINT, SIGTERM
 
@@ -47,10 +42,25 @@ try:
 except:
     haveSIGUSR1 = False
 
+# ------------------------------------------------------------------------------------------------------------
+# Imports (PyQt5)
+
+from PyQt5.Qt import PYQT_VERSION_STR
+from PyQt5.QtCore import qFatal, QT_VERSION, QT_VERSION_STR, qWarning, QDir, QSettings
+from PyQt5.QtGui import QIcon
+from PyQt5.QtWidgets import QFileDialog, QMessageBox
+
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
 
-from carla_backend_qt import *
+from carla_backend import (
+    kIs64bit, HAIKU, LINUX, MACOS, WINDOWS,
+    MAX_DEFAULT_PARAMETERS,
+    ENGINE_PROCESS_MODE_MULTIPLE_CLIENTS,
+    ENGINE_PROCESS_MODE_PATCHBAY,
+    ENGINE_TRANSPORT_MODE_INTERNAL,
+    ENGINE_TRANSPORT_MODE_JACK
+)
 
 # ------------------------------------------------------------------------------------------------------------
 # Platform specific stuff
@@ -487,19 +497,21 @@ readEnvVars = True
 
 if WINDOWS:
     # Check if running Wine. If yes, ignore env vars
+    # pylint: disable=import-error
     from winreg import ConnectRegistry, OpenKey, CloseKey, HKEY_CURRENT_USER
-    reg = ConnectRegistry(None, HKEY_CURRENT_USER)
+    # pylint: enable=import-error
+    _reg = ConnectRegistry(None, HKEY_CURRENT_USER)
 
     try:
-        key = OpenKey(reg, r"SOFTWARE\Wine")
-        CloseKey(key)
-        del key
+        _key = OpenKey(_reg, r"SOFTWARE\Wine")
+        CloseKey(_key)
+        del _key
         readEnvVars = False
     except:
         pass
 
-    CloseKey(reg)
-    del reg
+    CloseKey(_reg)
+    del _reg
 
 if readEnvVars:
     CARLA_DEFAULT_LADSPA_PATH = os.getenv("LADSPA_PATH", DEFAULT_LADSPA_PATH).split(splitter)
@@ -534,18 +546,13 @@ del DEFAULT_SFZ_PATH
 # Global Carla object
 
 class CarlaObject(object):
-    __slots__ = [
-        'gui',   # Host Window
-        'nogui', # Skip UI
-        'term',  # Terminated by OS signal
-        'utils'  # Utils object
-    ]
+    def __init__(self):
+        self.gui   = None  # Host Window
+        self.nogui = False # Skip UI
+        self.term  = False # Terminated by OS signal
+        self.utils = None  # Utils object
 
 gCarla = CarlaObject()
-gCarla.gui   = None
-gCarla.nogui = False
-gCarla.term  = False
-gCarla.utils = None
 
 # ------------------------------------------------------------------------------------------------------------
 # Set CWD
@@ -605,10 +612,9 @@ def isNumber(value):
 def toList(value):
     if value is None:
         return []
-    elif not isinstance(value, list):
+    if not isinstance(value, list):
         return [value]
-    else:
-        return value
+    return value
 
 # ------------------------------------------------------------------------------------------------------------
 # Get Icon from user theme, using our own as backup (Oxygen)
@@ -672,10 +678,9 @@ def handleInitialCommandLineArguments(file):
 # ------------------------------------------------------------------------------------------------------------
 # Get initial project file (as passed in the command-line parameters)
 
-def getInitialProjectFile(app, skipExistCheck = False):
-    # FIXME - PyQt mishandles unicode characters, we'll use direct sys.argv for now
+def getInitialProjectFile(skipExistCheck = False):
+    # NOTE: PyQt mishandles unicode characters, we directly use sys.argv instead of qApp->arguments()
     # see https://riverbankcomputing.com/pipermail/pyqt/2015-January/035395.html
-    #args = app.arguments()[1:]
     args = sys.argv[1:]
     for arg in args:
         if arg.startswith("--with-appname=") or arg.startswith("--with-libprefix=") or arg.startswith("--osc-gui="):
@@ -784,7 +789,7 @@ class QMessageBoxWithBetterWidth(QMessageBox):
 
         lines = self.text().strip().split("\n") + self.informativeText().strip().split("\n")
 
-        if len(lines) > 0:
+        if lines:
             width = 0
 
             for line in lines:
@@ -798,18 +803,19 @@ class QMessageBoxWithBetterWidth(QMessageBox):
 # Safer QSettings class, which does not throw if type mismatches
 
 class QSafeSettings(QSettings):
-    def value(self, key, defaultValue, type):
-        if not isinstance(defaultValue, type):
+    def value(self, key, defaultValue, valueType):
+        if not isinstance(defaultValue, valueType):
             print("QSafeSettings.value() - defaultValue type mismatch for key", key)
 
         try:
-            return QSettings.value(self, key, defaultValue, type)
+            return QSettings.value(self, key, defaultValue, valueType)
         except:
             return defaultValue
 
 # ------------------------------------------------------------------------------------------------------------
 # Custom MessageBox
 
+# pylint: disable=too-many-arguments
 def CustomMessageBox(parent, icon, title, text,
                      extraText="",
                      buttons=QMessageBox.Yes|QMessageBox.No,
@@ -822,5 +828,6 @@ def CustomMessageBox(parent, icon, title, text,
     msgBox.setStandardButtons(buttons)
     msgBox.setDefaultButton(defButton)
     return msgBox.exec_()
+# pylint: enable=too-many-arguments
 
 # ------------------------------------------------------------------------------------------------------------
diff --git a/source/frontend/carla_skin.py b/source/frontend/carla_skin.py
index 530d2a1b4..74cbe31db 100644
--- a/source/frontend/carla_skin.py
+++ b/source/frontend/carla_skin.py
@@ -19,9 +19,9 @@
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Global)
 
-from PyQt5.QtCore import Qt, QRectF, QLineF
-from PyQt5.QtGui import QFont, QFontDatabase, QPen
-from PyQt5.QtWidgets import QColorDialog, QFrame, QPushButton
+from PyQt5.QtCore import Qt, QRectF, QLineF, QTimer
+from PyQt5.QtGui import QColor, QFont, QFontDatabase, QPainter, QPainterPath, QPen
+from PyQt5.QtWidgets import QColorDialog, QFrame, QLineEdit, QPushButton
 
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
@@ -32,8 +32,11 @@ import ui_carla_plugin_compact
 import ui_carla_plugin_default
 import ui_carla_plugin_presets
 
+from carla_backend import *
+from carla_shared import *
 from carla_widgets import *
 from widgets.digitalpeakmeter import DigitalPeakMeter
+from widgets.paramspinbox import CustomInputDialog
 from widgets.scalabledial import ScalableDial
 
 # ------------------------------------------------------------------------------------------------------------
@@ -205,11 +208,6 @@ class AbstractPluginSlot(QFrame, PluginEditParentMeta):
         self.host = host
         self.fParent = parent
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         # -------------------------------------------------------------
         # Get plugin info
 
@@ -2005,13 +2003,6 @@ class PluginSlot_Presets(AbstractPluginSlot):
 # ------------------------------------------------------------------------------------------------------------
 
 def getColorAndSkinStyle(host, pluginId):
-    if False:
-        # kdevelop likes this :)
-        host       = CarlaHostNull()
-        progCount  = 0
-        pluginInfo = PyCarlaPluginInfo
-        pluginName = ""
-
     pluginInfo  = host.get_plugin_info(pluginId)
     pluginName  = host.get_real_plugin_name(pluginId)
     pluginLabel = pluginInfo['label'].lower()
diff --git a/source/frontend/carla_utils.py b/source/frontend/carla_utils.py
index 128b63881..ed120f277 100644
--- a/source/frontend/carla_utils.py
+++ b/source/frontend/carla_utils.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 
 # Carla Backend utils
-# Copyright (C) 2011-2018 Filipe Coelho <falktx@falktx.com>
+# Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as
@@ -22,10 +22,48 @@
 from os import environ
 from sys import argv
 
+# ------------------------------------------------------------------------------------------------------------
+# Imports (ctypes)
+
+from ctypes import (
+    c_bool, c_char_p, c_double, c_int, c_uint, c_uint32, c_void_p,
+    cdll, Structure,
+    CFUNCTYPE, POINTER
+)
+
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
 
-from carla_backend import *
+from carla_backend import (
+    PLUGIN_NONE,
+    PLUGIN_INTERNAL,
+    PLUGIN_LADSPA,
+    PLUGIN_DSSI,
+    PLUGIN_LV2,
+    PLUGIN_VST2,
+    PLUGIN_VST3,
+    PLUGIN_AU,
+    PLUGIN_DLS,
+    PLUGIN_GIG,
+    PLUGIN_SF2,
+    PLUGIN_SFZ,
+    PLUGIN_JACK,
+    PLUGIN_CATEGORY_NONE,
+    PLUGIN_CATEGORY_SYNTH,
+    PLUGIN_CATEGORY_DELAY,
+    PLUGIN_CATEGORY_EQ,
+    PLUGIN_CATEGORY_FILTER,
+    PLUGIN_CATEGORY_DISTORTION,
+    PLUGIN_CATEGORY_DYNAMICS,
+    PLUGIN_CATEGORY_MODULATOR,
+    PLUGIN_CATEGORY_UTILITY,
+    PLUGIN_CATEGORY_OTHER,
+    WINDOWS,
+    c_enum, c_uintptr,
+    charPtrToString,
+    charPtrPtrToStringList,
+    structToDict
+)
 
 # ------------------------------------------------------------------------------------------------------------
 
@@ -46,6 +84,10 @@ def getPluginTypeAsString(ptype):
         return "VST3"
     if ptype == PLUGIN_AU:
         return "AU"
+    if ptype == PLUGIN_DLS:
+        return "DLS"
+    if ptype == PLUGIN_GIG:
+        return "GIG"
     if ptype == PLUGIN_SF2:
         return "SF2"
     if ptype == PLUGIN_SFZ:
@@ -53,7 +95,7 @@ def getPluginTypeAsString(ptype):
     if ptype == PLUGIN_JACK:
         return "JACK"
 
-    print("getPluginTypeAsString(%i) - invalid type" % ptype);
+    print("getPluginTypeAsString(%i) - invalid type" % ptype)
     return "Unknown"
 
 def getPluginTypeFromString(stype):
@@ -78,6 +120,10 @@ def getPluginTypeFromString(stype):
         return PLUGIN_VST3
     if stype in ("au", "audiounit"):
         return PLUGIN_AU
+    if stype == "dls":
+        return PLUGIN_DLS
+    if stype == "gig":
+        return PLUGIN_GIG
     if stype == "sf2":
         return PLUGIN_SF2
     if stype == "sfz":
@@ -295,14 +341,19 @@ class CarlaUtils(object):
         self.lib.carla_x11_get_window_pos.argtypes = [c_uintptr]
         self.lib.carla_x11_get_window_pos.restype = POINTER(c_int)
 
+        self._pipeClientFunc = None
+        self._pipeClientCallback = None
+
         # use _putenv on windows
         if not WINDOWS:
             self.msvcrt = None
             return
 
         self.msvcrt = cdll.msvcrt
+        # pylint: disable=protected-access
         self.msvcrt._putenv.argtypes = [c_char_p]
         self.msvcrt._putenv.restype = None
+        # pylint: enable=protected-access
 
     # --------------------------------------------------------------------------------------------------------
 
@@ -312,7 +363,9 @@ class CarlaUtils(object):
 
         if WINDOWS:
             keyvalue = "%s=%s" % (key, value)
+            # pylint: disable=protected-access
             self.msvcrt._putenv(keyvalue.encode("utf-8"))
+            # pylint: enable=protected-access
 
     # unset environment variable
     def unsetenv(self, key):
@@ -321,7 +374,9 @@ class CarlaUtils(object):
 
         if WINDOWS:
             keyrm = "%s=" % key
+            # pylint: disable=protected-access
             self.msvcrt._putenv(keyrm.encode("utf-8"))
+            # pylint: enable=protected-access
 
     # --------------------------------------------------------------------------------------------------------
 
diff --git a/source/frontend/carla_widgets.py b/source/frontend/carla_widgets.py
index b249abca1..57a89b677 100755
--- a/source/frontend/carla_widgets.py
+++ b/source/frontend/carla_widgets.py
@@ -19,9 +19,14 @@
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Global)
 
-from PyQt5.QtCore import pyqtSignal, pyqtSlot, Qt, QByteArray, QTimer
-from PyQt5.QtGui import QColor, QCursor, QFontMetrics, QPainter, QPainterPath, QPalette, QPixmap
-from PyQt5.QtWidgets import QDialog, QGroupBox, QInputDialog, QLineEdit, QMenu, QScrollArea, QVBoxLayout, QWidget
+from abc import abstractmethod
+
+# ------------------------------------------------------------------------------------------------------------
+# Imports (PyQt5)
+
+from PyQt5.QtCore import pyqtSignal, pyqtSlot, Qt, QByteArray
+from PyQt5.QtGui import QCursor, QIcon, QPalette, QPixmap
+from PyQt5.QtWidgets import QDialog, QFileDialog, QInputDialog, QMenu, QMessageBox, QScrollArea, QVBoxLayout, QWidget
 
 # ------------------------------------------------------------------------------------------------------------
 # Imports (Custom)
@@ -31,10 +36,61 @@ import ui_carla_about_juce
 import ui_carla_edit
 import ui_carla_parameter
 
-from carla_shared import *
-from carla_utils import *
+from carla_backend import (
+    MACOS, WINDOWS,
+    BINARY_NATIVE,
+    PLUGIN_INTERNAL,
+    PLUGIN_DSSI,
+    PLUGIN_LV2,
+    PLUGIN_VST2,
+    PLUGIN_SF2,
+    PLUGIN_SFZ,
+    PLUGIN_CAN_DRYWET,
+    PLUGIN_CAN_VOLUME,
+    PLUGIN_CAN_BALANCE,
+    PLUGIN_CAN_PANNING,
+    PLUGIN_CATEGORY_SYNTH,
+    PLUGIN_OPTION_FIXED_BUFFERS,
+    PLUGIN_OPTION_FORCE_STEREO,
+    PLUGIN_OPTION_MAP_PROGRAM_CHANGES,
+    PLUGIN_OPTION_USE_CHUNKS,
+    PLUGIN_OPTION_SEND_CONTROL_CHANGES,
+    PLUGIN_OPTION_SEND_CHANNEL_PRESSURE,
+    PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH,
+    PLUGIN_OPTION_SEND_PITCHBEND,
+    PLUGIN_OPTION_SEND_ALL_SOUND_OFF,
+    PLUGIN_OPTION_SEND_PROGRAM_CHANGES,
+    PARAMETER_DRYWET,
+    PARAMETER_VOLUME,
+    PARAMETER_BALANCE_LEFT,
+    PARAMETER_BALANCE_RIGHT,
+    PARAMETER_PANNING,
+    PARAMETER_CTRL_CHANNEL,
+    PARAMETER_IS_ENABLED,
+    PARAMETER_IS_AUTOMABLE,
+    PARAMETER_IS_READ_ONLY,
+    PARAMETER_USES_SCALEPOINTS,
+    PARAMETER_USES_CUSTOM_TEXT,
+    PARAMETER_CAN_BE_CV_CONTROLLED,
+    PARAMETER_INPUT, PARAMETER_OUTPUT,
+    CONTROL_VALUE_NONE,
+    CONTROL_VALUE_MIDI_PITCHBEND,
+    CONTROL_VALUE_CV
+)
+
+from carla_shared import (
+    MIDI_CC_LIST, MAX_MIDI_CC_LIST_ITEM,
+    VERSION,
+    countDecimalPoints,
+    fontMetricsHorizontalAdvance,
+    setUpSignals,
+    gCarla
+)
+
+from carla_utils import getPluginTypeAsString
+#)
+
 from widgets.collapsablewidget import CollapsibleBox
-from widgets.paramspinbox import CustomInputDialog
 from widgets.pixmapkeyboard import PixmapKeyboardHArea
 
 # ------------------------------------------------------------------------------------------------------------
@@ -54,10 +110,6 @@ class CarlaAboutW(QDialog):
         self.ui = ui_carla_about.Ui_CarlaAboutW()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-
         if host.isControl:
             extraInfo = " - <b>%s</b>" % self.tr("OSC Bridge Version")
         elif host.isPlugin:
@@ -66,10 +118,10 @@ class CarlaAboutW(QDialog):
             extraInfo = ""
 
         self.ui.l_about.setText(self.tr(""
-                                     "<br>Version %s"
-                                     "<br>Carla is a fully-featured audio plugin host%s.<br>"
-                                     "<br>Copyright (C) 2011-2020 falkTX<br>"
-                                     "" % (VERSION, extraInfo)))
+                                        "<br>Version %s"
+                                        "<br>Carla is a fully-featured audio plugin host%s.<br>"
+                                        "<br>Copyright (C) 2011-2020 falkTX<br>"
+                                        "" % (VERSION, extraInfo)))
 
         if self.ui.about.palette().color(QPalette.Background).blackF() < 0.5:
             self.ui.l_icons.setPixmap(QPixmap(":/bitmaps/carla_about_black.png"))
@@ -181,10 +233,6 @@ class CarlaAboutW(QDialog):
 
         self.setWindowFlags(flags)
 
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # JUCE About dialog
 
@@ -207,10 +255,6 @@ class JuceAboutW(QDialog):
 
         self.setWindowFlags(flags)
 
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # Plugin Parameter
 
@@ -226,11 +270,6 @@ class PluginParameter(QWidget):
         self.ui = ui_carla_parameter.Ui_PluginParameter()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            host = CarlaHostNull()
-            self.host = host
-
         # -------------------------------------------------------------
         # Internal stuff
 
@@ -562,12 +601,6 @@ class PluginEdit(QDialog):
         self.ui = ui_carla_edit.Ui_PluginEdit()
         self.ui.setupUi(self)
 
-        if False:
-            # kdevelop likes this :)
-            parent = PluginEditParentMeta()
-            host = CarlaHostNull()
-            self.host = host
-
         # -------------------------------------------------------------
         # Internal stuff
 
@@ -708,7 +741,8 @@ class PluginEdit(QDialog):
 
     @pyqtSlot(int, int, int, int)
     def slot_handleNoteOnCallback(self, pluginId, channel, note, velocity):
-        if self.fPluginId != pluginId: return
+        if self.fPluginId != pluginId:
+            return
 
         if self.fControlChannel == channel:
             self.ui.keyboard.sendNoteOn(note, False)
@@ -723,7 +757,8 @@ class PluginEdit(QDialog):
 
     @pyqtSlot(int, int, int)
     def slot_handleNoteOffCallback(self, pluginId, channel, note):
-        if self.fPluginId != pluginId: return
+        if self.fPluginId != pluginId:
+            return
 
         if self.fControlChannel == channel:
             self.ui.keyboard.sendNoteOff(note, False)
@@ -733,7 +768,7 @@ class PluginEdit(QDialog):
         if playItem in self.fPlayingNotes:
             self.fPlayingNotes.remove(playItem)
 
-        if len(self.fPlayingNotes) == 0 and self.fParent is not None:
+        if self.fPlayingNotes and self.fParent is not None:
             self.fParent.editDialogMidiActivityChanged(self.fPluginId, False)
 
     @pyqtSlot(int)
@@ -784,7 +819,7 @@ class PluginEdit(QDialog):
                 self.ui.cb_midi_programs.setItemText(mpIndex, "%03i:%03i - %s" % (mpBank+1, mpProg+1, mpName))
 
         # Update all parameter values
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             paramWidget.blockSignals(True)
             paramWidget.setValue(self.host.get_current_parameter_value(self.fPluginId, paramId))
             paramWidget.blockSignals(False)
@@ -922,7 +957,7 @@ class PluginEdit(QDialog):
         self.fTabIconTimers      = []
 
         # Remove all previous parameters
-        for x in range(self.ui.tabWidget.count()-1):
+        for _ in range(self.ui.tabWidget.count()-1):
             self.ui.tabWidget.widget(1).deleteLater()
             self.ui.tabWidget.removeTab(1)
 
@@ -1074,8 +1109,8 @@ class PluginEdit(QDialog):
     #------------------------------------------------------------------
 
     def clearNotes(self):
-         self.fPlayingNotes = []
-         self.ui.keyboard.allNotesOff()
+        self.fPlayingNotes = []
+        self.ui.keyboard.allNotesOff()
 
     def noteOn(self, channel, note, velocity):
         if self.fControlChannel == channel:
@@ -1109,25 +1144,25 @@ class PluginEdit(QDialog):
             self.fParametersToUpdate.append([parameterId, value])
 
     def setParameterDefault(self, parameterId, value):
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             if paramId == parameterId:
                 paramWidget.setDefault(value)
                 break
 
     def setParameterMappedControlIndex(self, parameterId, control):
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             if paramId == parameterId:
                 paramWidget.setMappedControlIndex(control)
                 break
 
     def setParameterMappedRange(self, parameterId, minimum, maximum):
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             if paramId == parameterId:
                 paramWidget.setMappedRange(minimum, maximum)
                 break
 
     def setParameterMidiChannel(self, parameterId, channel):
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             if paramId == parameterId:
                 paramWidget.setMidiChannel(channel+1)
                 break
@@ -1282,7 +1317,7 @@ class PluginEdit(QDialog):
             self.fCurrentStateFilename = None
 
         fileFilter = self.tr("Carla State File (*.carxs)")
-        filename, ok = QFileDialog.getSaveFileName(self, self.tr("Save Plugin State File"), filter=fileFilter)
+        filename, _ = QFileDialog.getSaveFileName(self, self.tr("Save Plugin State File"), filter=fileFilter)
 
         # FIXME use ok value, test if it works as expected
         if not filename:
@@ -1312,7 +1347,7 @@ class PluginEdit(QDialog):
             return
 
         fileFilter = self.tr("Carla State File (*.carxs)")
-        filename, ok = QFileDialog.getOpenFileName(self, self.tr("Open Plugin State File"), filter=fileFilter)
+        filename, _ = QFileDialog.getOpenFileName(self, self.tr("Open Plugin State File"), filter=fileFilter)
 
         # FIXME use ok value, test if it works as expected
         if not filename:
@@ -1541,7 +1576,8 @@ class PluginEdit(QDialog):
         if actSelected == actSet:
             current   = minimum + (maximum-minimum)*(float(sender.value())/10000)
             value, ok = QInputDialog.getInt(self, self.tr("Set value"), label, round(current*100.0), round(minimum*100.0), round(maximum*100.0), 1)
-            if ok: value = float(value)/100.0
+            if ok:
+                value = float(value)/100.0
 
             if not ok:
                 return
@@ -1594,7 +1630,7 @@ class PluginEdit(QDialog):
         groupWidgets = {}
 
         for paramList, width in paramListFull:
-            if len(paramList) == 0:
+            if not paramList:
                 break
 
             tabIndex = self.ui.tabWidget.count()
@@ -1678,7 +1714,7 @@ class PluginEdit(QDialog):
             self.setMidiProgram(mpIndex)
 
     def _updateParameterValues(self):
-        for paramType, paramId, paramWidget in self.fParameterList:
+        for _, paramId, paramWidget in self.fParameterList:
             paramWidget.blockSignals(True)
             paramWidget.setValue(self.host.get_current_parameter_value(self.fPluginId, paramId))
             paramWidget.blockSignals(False)
@@ -1694,7 +1730,7 @@ class PluginEdit(QDialog):
 
     def testTimerClose(self):
         self.close()
-        app.quit()
+        _app.quit()
 
     #------------------------------------------------------------------
 
@@ -1714,30 +1750,26 @@ class PluginEdit(QDialog):
 
         QDialog.timerEvent(self, event)
 
-    def done(self, r):
-        QDialog.done(self, r)
-        self.close()
-
 # ------------------------------------------------------------------------------------------------------------
 # Main
 
 if __name__ == '__main__':
     from carla_app import CarlaApplication
-    from carla_host import initHost, loadHostSettings
+    from carla_host import initHost as _initHost, loadHostSettings as _loadHostSettings
 
-    app  = CarlaApplication()
-    host = initHost("Widgets", None, False, False, False)
-    loadHostSettings(host)
+    _app  = CarlaApplication()
+    _host = _initHost("Widgets", None, False, False, False)
+    _loadHostSettings(_host)
 
-    host.engine_init("JACK", "Carla-Widgets")
-    host.add_plugin(BINARY_NATIVE, PLUGIN_DSSI, "/usr/lib/dssi/karplong.so", "karplong", "karplong", 0, None, 0x0)
-    host.set_active(0, True)
+    _host.engine_init("JACK", "Carla-Widgets")
+    _host.add_plugin(BINARY_NATIVE, PLUGIN_DSSI, "/usr/lib/dssi/karplong.so", "karplong", "karplong", 0, None, 0x0)
+    _host.set_active(0, True)
 
-    gui1 = CarlaAboutW(None, host)
+    gui1 = CarlaAboutW(None, _host)
     gui1.show()
 
-    gui2 = PluginEdit(None, host, 0)
+    gui2 = PluginEdit(None, _host, 0)
     gui2.testTimer()
     gui2.show()
 
-    app.exit_exec()
+    _app.exit_exec()