Hey these are all great suggestions! Lazos your plan sounds like the simplest place to start – I will give that a try first. Subq I’m hoping to repeat long phrases (like a minute or more even, repeating 1 or 2 times, decaying in volume with each repeat) rather than have a great number of repeats of short phrases (say 200 ms repeating 40 times) – though I definitely want to put the OT’s standard delay and reverb (and more and more effects!) on top of these long, repeating phrases.

I used to have the Boss DD-20 23-second delay, and 23 seconds was never quite long enough (there was a hack to get it to do 46 seconds, but it was not quite right if I remember correctly). The only thing longer has been looper pedals, but they don’t decay with repeats. If one of these methods posted here so far works, the OT has 85.5 MB RAM to play around with!