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Helix Hum In DAW Depending On USB Routing


roscoe5
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I am getting like a ground loop hum in my DAW's depending on Helix IO USB routing.

 

When I set USB 3/4 to be Helix-out>DAW-in and USB 5/6 to be DAW-out>Helix-in, I get a ground loop type hum.

 

When I reverse it with USB 5/6 to be Helix-out>DAW-in and USB 3/4 to be DAW-out>Helix-in, it goes away.

 

The PC and Helix are not on the same receptacle/surge protector-conditioner.  Helix is on an isobar strip on a separate outlet, which resolves hum with my amps.

 

Helix is on a USB 2.0 port on my PC.

 

Anyone else encounter this?

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