Hello, I’m scouring the forum for multibus issues and found yours. I’m similarly trying to get all sorts of combination of layouts woking acceptably in Logic, Cubase and Pro Tools. One thing I can’t see if you’ve mentioned with your Logic issue is whether you do a full reset for the rescan. I’ve found having to do this between changing supported layouts. The brute force script seems to be this (found elsewhere):
#!/bin/sh
sudo killall -9 AudioComponentRegistrar
rm ~/Library/Caches/AudioUnitCache/com.apple.audiounits.cache
rm ~/Library/Caches/com.apple.audiounits.cache
rm ~/Library/Preferences/com.apple.audio.InfoHelper.plist
rm ~/Library/Preferences/com.apple.logic.pro.cs
rm ~/Library/Preferences/com.apple.logic10.plist
rm ~/Library/Preferences/com.cockos.reaper.plist
But you coudl probably experiment to remove some of those lines. Note: this zaps your Logc prefs so you’ll need to reset some things like “Advanced” mode at least.