this looks nice and cheap, would probably do for me. funnily enough, i was starting to look at something similar (2-4channels) to help get the Blofeld and the AR into the MM without too much of an effort
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If you just want to mix a few things to go into another Elektron box, I’d look at Mackie Mix8 or Mix5.
I use a Mix5 to get a few things into an Analog Rytm and it works great. Fits into my case with 3 Elektrons.
They’re a bit smaller than the Peavey too. Of course, lack of faders makes things more compact.