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Hi Angelo

If the digital noise is only there when you input a line level signal with the pad off and 35db of gain this does not surpise me at all you will be overloadin the preamp with to much signal, if you are inputting a line level signal the pad should be ON.

I am more concerned when you say that if you remove all of the XLR inputs to the mixrack the noise still remains. it sounds like you have some kind of feedback loop. Please check all of your routing to see if this is the issue. An easy way to reset this would be to load a template show.

If the problem remains please explain in more detail exactly what you setup is.

Let me know how yo get on

Sam A&H