I had the same problem yesterday during my line check, just before a show, terrible panic : no sound coming out, from the main outs and the headphones.
Finally solve the problem :
-
Go to project menu
-
Midi settings
-
In the Midi Control menu, the “AUDIO NOTE OUT” selector was “EXT”. In this case the Octatrack is sending midi data but no sound. So I changed it for “INT + EXT” and restart the Octatrack, and miracle, the sound was back.
Hope this will help people who have similar problem