Frosty:

If you give us an example or two we may be able to make some useful comments.
I've found that some of the A/B part changes are fairly dramatic and some are
fairly subtle. Sometimes that's all you want, just a small change.

If you're referring to MIDI instument styles, I found I can get almost any amount of
"distinction" between A and B styles by using the Hybrid Style Maker. Just find
(say) a drum substyle that you like better for B and substitute it for the one that's there.

LLOYD S