Thanks everyone - AND I thought of one very specific example of what I might want to do:

Lets say that you wanted a horn or string section to hold some sort of a complex maj or min chord through a few bars while you played a series of related but different scale tone chords against it for maximum tension and resolve - a chord solo if you will. In that example I wouldn't be bothered if the drum kit kept up the basic rhythm. So I hit the pad where that sequence was stored in and voila. Same with other related sequences in the same song. So of course they were stored with the song and get loaded back in to the variation or performance pads when the song is pulled up. Next time I play the song I might want the same sequence w/o the drum backing. No problem - just stop the acc. and hit a button to trigger the prerecorded sequence - and you won't interfere with it or trigger another accompaniment chord no matter where you play on the keyboard.

I guess 32 measures worth is quite a bit - and certainly the chords could spill over from measure to measure to give the impression of a totally different flow.

It sure sounds to me like the fundamental goal of triggering a pre-recorded sequence with or without rythmic or chordal relationship to the main body of the song is doable.

thanks to everyone for the input..........

Mike H