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Apogee duet 2 hum / grounding issue?

Hi I have an Apogee Duet 2, using garageband on macbook. Whenever I run my guitar through XLR or instrument input I have a very loud hum that does not go away unless i put my hand on bare foot on the apogee. Its becoming annoying playing guitar with my foot on the thing any advice on how to sort this out?

Luke

60 cycle humm but only one power connection, I'm stumped

Hi everyone,
I'm not an audio engineer or even sure what one is but I have a problem with a humm. It happens when ever I have some audio device connected to the wall outlet. Let me explain further and see if one of you gurus sees how to fix it or at least track down the problem:

Universal Audio LA610 Hum issue

Im running a Moog Little Phatty Stage 2 into my LA610 and from the 610 into my Yamaha 01V96 and Im getting a buzz. 2 weeks ago I wasn't...

The exact signal flow including cables is this:
Moog via Mogami TRS to Male XLR cable into the LA610's line input, out of the LA610's line output via Mogami Female XLR cable to TRS into my 01V96.

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