When I used to use a drum machine I could simply press button 1 for pattern A and button 2 for B, and maybe #3 for a fill, etc. Why don't arrangers have loop sequencers so we can play/record/set a chord/drum arrangement that repeats so we could use two hands for soloing or something else? Cakewalk has a loop feature, but I don't know if I could choose verse, chorus, bridge, etc. on the fly. Even Band-in-a-Box doesn't permit you to choose sections live. Does anything work that way?

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Cass Pawlowski - Motown
PSR2000, SC88, Cakewalk