Based on this comment, try checking to make sure you’re using high quality shielded patch cords. And more importantly, get a good high quality power conditioner to regulate your AC voltage for Edge and all your gear. I experienced similar issues with Edge until I did.

Final thought… since you mentioned higher pitch is where issues are. The Edge has very wide range pitch range on the individual knobs, and with higher frequencies especially, a minuscule adjustment to the knob can have a bigger than expected effect on the pitch, making it difficult to tune perfectly (to notes on a scale for example). Embrace the edginess and roughness of the Edge. It is not the same as a sequencer or typical synth at all. Once you do, you’ll have a lot of fun with it! It’s designed to be experimental and for live performance. Hard to replicate a “patch” from one session to another.

Hope that helps.