USB Latency Issues | Fractal Audio Systems Forum
Latency is when there is a delay in what you hear relatives to what you play (not an additional signal, which is what you seem to be describing).
It sounds like you’re describing the typical result of going in to a DAW and hearing both the “local” signal plus the return signal from the DAW.
Is there any sound coming from your computer speakers? Or is it all coming from the monitors?
Without a DAW or something else running on your computer I don’t know why the USB would cause that.
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