It might seem straightforward to you, but it isn't to me.

Stopping all instruments, and just leaving drums on is easy. Starting all instruments again is easy.

What I cannot get is a drum roll on the first bar....can you?

What I get is one bar of regular drums, ....no nice little roll. I can get either 'A' pattern, or 'B' pattern, but no intro roll

Have you actually tried it?

Vincent