Make sure that the legacy AU rez file is correct for midi effect AUs

examples/PlugInSamples/Arpeggiator/Builds/MacOSX/Info-Shared_Code.plist

@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist>
-  <dict>
-    <key>CFBundleExecutable</key>
-    <string>${EXECUTABLE_NAME}</string>
-    <key>CFBundleIconFile</key>
-    <string></string>
-    <key>CFBundleIdentifier</key>
-    <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-    <key>CFBundleName</key>
-    <string>Arpeggiator</string>
-    <key>CFBundleDisplayName</key>
-    <string>Arpeggiator</string>
-    <key>CFBundlePackageType</key>
-    <string>FMWK</string>
-    <key>CFBundleSignature</key>
-    <string>????</string>
-    <key>CFBundleShortVersionString</key>
-    <string>1.0.0</string>
-    <key>CFBundleVersion</key>
-    <string>1.0.0</string>
-    <key>NSHumanReadableCopyright</key>
-    <string>ROLI Ltd.</string>
-    <key>NSHighResolutionCapable</key>
-    <true/>
-  </dict>
-</plist>

examples/PlugInSamples/Arpeggiator/JuceLibraryCode/AppConfig.h

@@ -296,7 +296,7 @@
  #define JucePlugin_VSTCategory            kPlugCategEffect
 #endif
 #ifndef  JucePlugin_AUMainType
- #define JucePlugin_AUMainType             kAudioUnitType_Effect
+ #define JucePlugin_AUMainType             'aumi'
 #endif
 #ifndef  JucePlugin_AUSubType
  #define JucePlugin_AUSubType              JucePlugin_PluginCode

extras/Projucer/Source/Project/jucer_Project.cpp

@@ -1121,9 +1121,12 @@ String Project::getAUMainTypeString()
 
     if (s.isEmpty())
     {
-        if (getPluginIsSynth().getValue())              s = "kAudioUnitType_MusicDevice";
-        else if (getPluginWantsMidiInput().getValue())  s = "kAudioUnitType_MusicEffect";
-        else                                            s = "kAudioUnitType_Effect";
+        // Unfortunately, Rez uses a header where kAudioUnitType_MIDIProcessor is undefined
+        // Use aumi instead.
+        if      (getPluginIsMidiEffectPlugin().getValue()) s = "'aumi'";
+        else if (getPluginIsSynth().getValue())            s = "kAudioUnitType_MusicDevice";
+        else if (getPluginWantsMidiInput().getValue())     s = "kAudioUnitType_MusicEffect";
+        else                                               s = "kAudioUnitType_Effect";
     }
 
     return s;