This isn’t really for my mod duo, but I have an alesis multimix that I use as a usb sound card to record the output from my duo and recently I’ve started getting a high pitched ground loop whine. There’s a few usb isolators for sale on amazon but it gets really expensive if you look at higher speed versions, not that I need the high speed version but some say the low speed versions don’t work with focusrite gear and I don’t want to rule out future purchases.
For now I’ve plugged in a usb extender cable and it’s mostly got rid of the problem in the volume range I normally use, but returns if I crank the volume on the mixer, so I’m just wondering if I’ll get better results with an isolator and if anyone can recommend one.