I'm afraid you just didn't look close enough! The XBase 09 has analog bassdrum, snare and toms, and then some 8bit (?) samples for hihats, claps and ride/crash. There would have been your target
I recommend you get educated in electronics so that you recognise a memory chip when you see one. Maybe you'll even figure out how amplifiers are built from transistors, and how opamps work (your "awesome overdrive" comes from mangling with those).
You stressed a lot of times that you are living off this, and it's been years, so I just can't understand how you can NOT get knowledgeable in the field you are working in.
If you continue like that, you'll keep poking circuits randomly with your finger forever. Guess what: I never did that, I came up with all my bends through thinking, planning, figuring out and THEN trying out stuff.