I created a file from scratch, and originally had everything muted except bass and drums. I made some note changes to the bass part, so had that part frozen. I created a wav file with this setup and then saved the BIAB file. Now I can't seem to make any changes, such as muting, volume, panning to bass or drums. I can unmute and control the other parts, but bass and drums seem to be frozen, and always play. I unfroze the bass part, but still can't change it. I saved and reopened the file, changed to a different style, exited and reopened BIAB, looked for possible settings that might cause this, but nothing helps. Any ideas??