Thank you all

I believe I have at least a cursory understanding except I didn't see where I can compile a group of favorite sounds from different groups. The Audya has 20 slots in a group that can be brought up with one press configured any way you want. I know I can use OTS and sets for a work around, but when playing over a midi eg, it is handy to grab any sound you want.

If and when I pull the trigger, I will have more specific questions.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact