@taktik Found some info about macos AudioComponentRegistrar and wanted to share with you. Regarding the audiounit scanning, you might
restart the “AudioComponentRegistrar” process before scanning, so AudioUnits, which were installed after renoise was opened, will be found, too. Please read here: https://www.kvraudio.com/forum/viewtopic.php?p=7512145#p7512145
as well use that AudioComponentRegistrar for fully search audiounits, so getting rid of you own custom code?
Currently Renoise always needs to be restarted, for seeing newly installed AUs. So manual scanning is a bit misleading here, the way it currently behaves.