My BossaBrushes folder has a mix including audio files, just as described for "58-78Pop^". My BossaBrushes#1 folder contains only .txt files. The same is true on both the UltraPak disk and the internal disk.

If I choose either "BossaBrushes" or "BossaBrushes#1", when I run from the UltraPak disk it works, and when I run from the internal disk one the drums are silent. When I run from the internal disk, no RealDrum sound I've tried makes any sound.

The Drums part is green in the instrument list at the top of the screen, like the Piano and Bass parts.

This is becoming bizarre …