juce_AUv3_Wrapper.mm - auvaltool failure and work-around

[reuk]

This sounds like a previously-discussed bug in auval on monterey:

Br: auv3 + midi out doesn't pass auvaltool on macos 12

I’ve investigated this a bit now, testing on Catalina (Intel) and Monterey (Arm). When the plugin’s main type is MusicDevice, then validation succeeds on Catalina but fails on Monterey. When the plugin’s main type is MidiEffect, then the validation succeeds on both platforms. Finally, if I modify the AUv3 wrapper so that it never calls MIDIOutputEventBlock or tries to send MIDI, but keep everything else the same (i.e. it still declares that it wants MIDI in and out, and has a type of MusicDev…

I’ve let Apple know about the issue, but haven’t heard anything back yet.