diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6d39a68..60a09fe 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,7 +26,7 @@ jobs:
           echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports bionic-updates main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ports-arm64.list
           echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports bionic-backports main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ports-arm64.list
           sudo apt-get update -qq
-          sudo apt-get install -yq g++-aarch64-linux-gnu libasound2-dev:arm64 libcairo2-dev:arm64 libgl1-mesa-dev:arm64 liblo-dev:arm64 libpulse-dev:arm64 libx11-dev:arm64 libxcursor-dev:arm64 libxext-dev:arm64 libxrandr-dev:arm64 qemu-user-static
+          sudo apt-get install -yq g++-aarch64-linux-gnu libasound2-dev:arm64 libcairo2-dev:arm64 libgl1-mesa-dev:arm64 liblo-dev:arm64 libpulse-dev:arm64 libx11-dev:arm64 libxcursor-dev:arm64 libxext-dev:arm64 libxrandr-dev:arm64 qemu-user-static xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev:arm64 libxinerama-dev:arm64
           # fix broken Ubuntu packages missing pkg-config file in multi-arch package
@@ -41,7 +41,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -68,7 +68,7 @@ jobs:
           echo "deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports bionic-updates main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ports-armhf.list
           echo "deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports bionic-backports main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ports-armhf.list
           sudo apt-get update -qq
-          sudo apt-get install -yq g++-arm-linux-gnueabihf libasound2-dev:armhf libcairo2-dev:armhf libgl1-mesa-dev:armhf liblo-dev:armhf libpulse-dev:armhf libx11-dev:armhf libxcursor-dev:armhf libxext-dev:armhf libxrandr-dev:armhf qemu-user-static
+          sudo apt-get install -yq g++-arm-linux-gnueabihf libasound2-dev:armhf libcairo2-dev:armhf libgl1-mesa-dev:armhf liblo-dev:armhf libpulse-dev:armhf libx11-dev:armhf libxcursor-dev:armhf libxext-dev:armhf libxrandr-dev:armhf qemu-user-static xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev:armhf libxinerama-dev:armhf
           # fix broken Ubuntu packages missing pkg-config file in multi-arch package
@@ -83,7 +83,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -106,7 +106,7 @@ jobs:
         run: |
           sudo dpkg --add-architecture i386
           sudo apt-get update -qq
-          sudo apt-get install -yq g++-i686-linux-gnu libasound2-dev:i386 libcairo2-dev:i386 libgl1-mesa-dev:i386 liblo-dev:i386 libpulse-dev:i386 libx11-dev:i386 libxcursor-dev:i386 libxext-dev:i386 libxrandr-dev:i386
+          sudo apt-get install -yq g++-i686-linux-gnu libasound2-dev:i386 libcairo2-dev:i386 libgl1-mesa-dev:i386 liblo-dev:i386 libpulse-dev:i386 libx11-dev:i386 libxcursor-dev:i386 libxext-dev:i386 libxrandr-dev:i386 xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev:i386 libxinerama-dev:i386
       - name: Build linux x86
@@ -119,7 +119,7 @@ jobs:
           PKG_CONFIG_PATH: /usr/lib/i386-linux-gnu/pkgconfig
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -141,7 +141,7 @@ jobs:
       - name: Set up dependencies
         run: |
           sudo apt-get update -qq
-          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev
+          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev libxinerama-dev
       - name: Build linux x86_64
@@ -149,7 +149,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -171,7 +171,7 @@ jobs:
       - name: Set up dependencies
         run: |
           sudo apt-get update -qq
-          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev
+          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev libxinerama-dev
       - name: Build linux x86_64 (debug)
@@ -179,7 +179,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
           make features
-          make DEBUG=true -j $(nproc)
+          xvfb-run make DEBUG=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -230,7 +230,7 @@ jobs:
         run: |
           sudo dpkg --add-architecture i386
           sudo apt-get update -qq
-          sudo apt-get install -yq binutils-mingw-w64-i686 g++-mingw-w64-i686 mingw-w64 wine-stable:i386
+          sudo apt-get install -yq binutils-mingw-w64-i686 g++-mingw-w64-i686 mingw-w64 wine-stable:i386 xvfb
       - name: Build win32 cross-compiled
         env:
           CC: i686-w64-mingw32-gcc
@@ -240,7 +240,7 @@ jobs:
           WINEDEBUG: "-all"
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -262,7 +262,7 @@ jobs:
       - name: Set up dependencies
         run: |
           sudo apt-get update -qq
-          sudo apt-get install -yq binutils-mingw-w64-x86-64 g++-mingw-w64-x86-64 mingw-w64 wine-stable
+          sudo apt-get install -yq binutils-mingw-w64-x86-64 g++-mingw-w64-x86-64 mingw-w64 wine-stable xvfb
       - name: Build win64 cross-compiled
         env:
           CC: x86_64-w64-mingw32-gcc
@@ -272,7 +272,7 @@ jobs:
           WINEDEBUG: "-all"
         run: |
           make features
-          make WITH_LTO=true -j $(nproc)
+          xvfb-run make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"
@@ -298,7 +298,7 @@ jobs:
           sudo dpkg -i kxstudio-repos_10.0.3_all.deb
           sudo apt-get update -qq
           # build-deps
-          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev
+          sudo apt-get install -yq libasound2-dev libcairo2-dev libgl1-mesa-dev liblo-dev libpulse-dev libx11-dev libxcursor-dev libxext-dev libxrandr-dev xvfb
           # extra for vcv deps
           sudo apt-get install -yq libxi-dev libxinerama-dev
           # runtime testing
@@ -310,7 +310,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
           make features
-          make NOOPT=true SKIP_STRIPPING=true -j $(nproc)
+          xvfb-run make NOOPT=true SKIP_STRIPPING=true -j $(nproc)
       - name: Validate LV2 ttl syntax
         run: |
           lv2_validate \
@@ -327,56 +327,34 @@ jobs:
               /usr/lib/lv2/{atom,buf-size,core,data-access,kx-control-input-port-change-request,kx-programs,instance-access,midi,parameters,port-groups,port-props,options,patch,presets,resize-port,state,time,ui,units,urid,worker}.lv2 \
               ${LV2_PATH}
           lv2lint -s lv2_generate_ttl -l ld-linux-x86-64.so.2 -M nopack $(lv2ls)
-      - name: Test LADSPA plugins
-        run: |
-            for p in $(ls bin/ | grep ladspa.so); do \
-                env CARLA_BRIDGE_DUMMY=1 CARLA_BRIDGE_TESTING=native \
-                    valgrind \
-                    --error-exitcode=255 \
-                    --leak-check=no \
-                    --track-origins=yes \
-                    --suppressions=./dpf/utils/valgrind-dpf.supp \
-                    /usr/lib/carla/carla-bridge-native ladspa ./bin/${p} "" 1>/dev/null; \
-            done
-      - name: Test DSSI plugins
-        run: |
-            for p in $(ls bin/ | grep dssi.so); do \
-                env CARLA_BRIDGE_DUMMY=1 CARLA_BRIDGE_TESTING=native \
-                    valgrind \
-                    --error-exitcode=255 \
-                    --leak-check=no \
-                    --track-origins=yes \
-                    --suppressions=./dpf/utils/valgrind-dpf.supp \
-                    /usr/lib/carla/carla-bridge-native dssi ./bin/${p} "" 1>/dev/null; \
-            done
-      - name: Test LV2 plugins
+      - name: Test LV2 plugin
         run: |
             export LV2_PATH=/tmp/lv2-path
             for p in $(lv2ls); do \
                 env CARLA_BRIDGE_DUMMY=1 CARLA_BRIDGE_TESTING=native \
-                    valgrind \
+                    xvfb-run valgrind \
                     --error-exitcode=255 \
                     --leak-check=no \
                     --track-origins=yes \
                     --suppressions=./dpf/utils/valgrind-dpf.supp \
                     /usr/lib/carla/carla-bridge-native lv2 "" ${p} 1>/dev/null; \
             done
-      - name: Test VST2 plugins
+      - name: Test VST2 plugin
         run: |
             for p in $(ls bin/ | grep vst.so); do \
                 env CARLA_BRIDGE_DUMMY=1 CARLA_BRIDGE_TESTING=native \
-                    valgrind \
+                    xvfb-run valgrind \
                     --error-exitcode=255 \
                     --leak-check=no \
                     --track-origins=yes \
                     --suppressions=./dpf/utils/valgrind-dpf.supp \
                     /usr/lib/carla/carla-bridge-native vst2 ./bin/${p} "" 1>/dev/null; \
             done
-      - name: Test VST3 plugins
+      - name: Test VST3 plugin
         run: |
             for p in $(ls bin/ | grep vst3); do \
                 env CARLA_BRIDGE_DUMMY=1 CARLA_BRIDGE_TESTING=native \
-                    valgrind \
+                    xvfb-run valgrind \
                     --error-exitcode=255 \
                     --leak-check=no \
                     --track-origins=yes \