I've build a 4-input Darwin board that sends the output directly from the loop out (I didn't need switchable outputs). I can faintly hear the signal playing in adjacent outputs. For example, if I have output 2 selected and audio is playing in output 1, I can faintly hear what is playing in output 1. This isn't the case if, for example, I have output 4 selected and have audio in output 1.

I'm using high-quality teflon-insulated silver-coated wiring for my interconnects.

Any ideas what could be causing this?

Thanks in advance!