Originally Posted By: Andrew - PG Music
In addition to checking if Reaper can see the DLSMusicDevice, can you please navigate in Finder to /System/Library/Components, and compare the contents to my screenshot here:



By doing this, I can only see the following components :
- AppleScript
- AudioCodecs
- AudioDsp
- AuSpeechSyntesis
- CoreAudio
- JavaScript

But I can't see the others that are on your screenshot

OH