@ja_kub_sz
I have a MU1. As. A newbie I had a few hickups (me more than the unit) and reached out to Grimm in Amsterdam and they and their US guy in California were very helpful. Now that I’m fluid operating is easy. Even big knob on top is simple but it’s seldom used.
MU2 manual is online and details how to load files to internal SD. Did this w/ my files and then sold Roon Nucleus. (Kept HD w/ tracks for s backup but don’t need or use.)
432 Evo Master may be great but pimping it here turned me off.