ERROR: -10850 IN CALL MusicDeviceMIDIEvent

Hi, anyone got any ideas on this error from auval?


There’s not much to go on there - perhaps the plugin is receiving midi messages that it didn’t expect. Can you reproduce the issue in a fresh or minimally-modified project? If so, please can you share the code so that we can try to reproduce the issue here? is a great starting point

kAudioUnitErr_PropertyNotInUse. Next step is to go read the header where that’s defined, they normally document what conditions it could be raised.

Thx for the answers guys, it was because I didn’t have


enabled. Looks like this is required, even if the plugin itself isn’t going to be processing any MIDI input.