I don't know about the drums. Channel 10 is correct. Once Real Drums came out, I never looked at the MIDI drums again, except to manually program in a drum hit or cymbal crash here and there, and the GM kit worked fine for that. As a composer, I found that MIDI drums were too 'perfect' and led me to write songs at a faster tempo than one at which the live drummer would sound good. Real Drums cured that.

Just for fun, double-check Channel 10 in BIAB this way: Opt, Preferences, Channels. Make sure it says '10' after Drums.

While you can easily program .PAT files, and I've made several, the .DK files in the /BB folder are not able to be edited. Perhaps you should inquire of PG Music support about how to get one for your Roland. If you find out, post the answer here please. Most of the .DK files I looked at referenced a Roland MT32, whatever that was.

By the way, I do not suspect your computer has anything to do with this. However, Bob is right to ask for your specs. Sometimes that does give us a clue or becomes invaluable in problem-solving for strange problems that only occur for some people.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.