Just got my Nano Cortex. I have tried two different amps and I get a loud hum when I connect. Ground button reduces a little, but still an issue. I am powering the Nano via USB on a Mac Mini.
Solved. Switched to a DC power source for the Nano and plugged both amp and Nano into a different wall outlet.
1 Like
Thanks for the update and glad you were able to resolve. And Welcome!