Sounds to me like a ground loop problem. Is the noise ever present in the headphones with nothing connected to the madiface except for the headphones and the link to the computer?
The circumstances do sound a bit strange, but that sort of noise is usually ground loop related which is why my thinking starts there.
If you have the madiface connected to the digico, but disconnect all the inputs on the digico, does the noise still happen? If the noise still happens then you can eliminate anything upstream of the digico as the source of the problem.
Last edited by drumphil; 01-10-2019 at 09:00 PM.
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