Hi Jules,
What do you think of adding
OSStatus HandleSysEx(const UInt8 *inData,
UInt32 inLength ) {
#if JucePlugin_WantsMidiInput
midiEvents.addEvent(inData, inLength, 0);
#endif
return noErr;
}
to the juce_AudioUnitWrapper.cpp file ? That way AU plugins will be notified of sysex events

pleeeease.