I just bought a 32r and I also cannot get playback from my 32R to work through Capture, Reaper, or Studio One artist on my Mac Mojave 2019 Mac mini. I can play WAV files from the Mac filesystem, and I hear them through the headphones which are plugged into the 32R.
I can record into reaper ( but not capture? I cannot figure out why). But cannot get any daw to playback through the 32r. I am not off to a good start here - the sole purpose of the 32r is for recording my synths in my studio.