If you want to erase a track that is one of the "style tracks" (like the bass track)

Erase will erase the track, but pressing PLAY will get the track rewritten, because it is part of the style.

The easiest way to accomplish what you want is disable the track. You can do this from the Save+ button (Save w/Patches dialog, and there is a column "On" which is whether the track is enabled or not. Disabling it will keep it empty.

Have Fun!
Peter Gannon
PG Music Inc.