I don't think this is the USB power.
Can you post a sample patch you this happens with? What algorithms are the patches using that demonstrate this issue?
Are all the notes being played on the same channel. For example, does it happen if you play 3 or more notes on channel 1, and if you play two notes on channel 1 and one note on channel 2.
Does this happen if you use a computer sequencer like Logic?
I have a video im gonna try to get posted today of the behavior. It's hard to explain, have to see it more to understand.
It happens randomly, i won't know what patch until I try it out and as for algorithms, I start with alg1 and move up to test the sounds. And in right hand corner every time I press a key on my arturia keystep "1234" shows up if that's what you mean by channel.
When I'm testing a patch, the I1 is the only one that I use, I2, I3, I4 all voice is turned off.
At bottom of screen you have "alg, velo and voic". For algorithm, velocity and voices.
When I run across a patch that sounds out of tune (just a random note, then it comes back in tune then another note goes out etc.) I usually have the "voic" parameter set to 6 or higher.. but if i lower that to 3 or lower, the key that was out of tune goes back into tune and the patch sounds fine, or if i unplug usb and plug usb back in and go right back to that same patch and sound, it's back to normal even if i turn the "voic" parameter higher than 3. Like I said it's random, and it may never happen on that patch again.
Also I don't use logic or computer sequencers etc.. I just plug keystep into the preenfm2, out from preen into my line 6 helix etc..
This whole issue makes no sense but I need to get to the bottom of it. Sure it's random and I can just unplug, plug back in or turn down to 3 voices or less when it happens and move on, but I shouldn't have too. Something is wrong for sure. I paid almost $300 off someone for this unit and I can't afford it to half work.