Hello — I have just uploaded an OM update (6.13) for Mac.
This update fixes a number of audio issues that some of you might have experimented in 6.12.
It will also better conform with the new macOS (10.12/10.13) GateKeeper’s security requirements, and is now distributed as a single standalone .app to put into your Applications folder.
As a consequence, a new location has to be set to store your basic OM libraries (RepMus, Profile, Esquisse etc.) The default location for that is in your home directory, /OM/Libraries/ but you’re free to specify another location in the OM Preferences.
More details about these changes are in the included readme.