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Old 6th September 2013
  #128
Lives for gear
 

When I had a 18i20 I noticed something similar. Turn gain on full on the 2 front preamps with nothing connected, then tap the top of the interface and you get some signal.

For me it was very low, but strange. I think the preamps will amplify any small signal or noise variation that reaches them, and you only notice it when you have the gain cranked.

I wouldn't worry about it though.you'll never need that level of gain unless you're recording a mime orchestra!

In fact, I'd be worried if you ever DID need that level of gain!
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