Thanks Mac but, sorry, it didn't work.

Did this:

Styles
Style Maker
Edit a Style
Opened style
Clicked on "Drum" radio button
Clicked on Style
Clicked on "Delete Instrument (all patterns, all rows for this instrument)
Numbers across A, B Drum fills, etc. disappeared.
Clicked Save As
Gave it a new name
Started a new song
Selected the new-named style from Browse Styles with Info
Chose the new style
Clicked Play
Original instrument still there