The short answer is that you cannot think of USB audio the same way as analog audio
I finally got to try exactly what it says in the manual as @shigginpit pointed out, but it doesn’t work 
As I don’t want any computers involved, it looks like I’m sweet out of luck, because I’ve been looking at USB compliant audio interfaces and also mixers, but I don’t think any of them can do what I was planning.
Damn. I think we only real option is to sample the RE-303 into the rytm and p-lock effects as a sample. Man, that sucks 
Thanks everyone for your help!!
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