In a thread from a year ago, which started off discussing an SC Editor (did it ever come about?), I started waffling about any possible replacement to the SC, then others discussed the quality of the output signal and USB audio drivers being insufficient for proper use. Is the output signal clean or not? I've posted about noise induced in the Juno-G when I connect to my PC via USB, a loop problem I suspect. Otherwise the sound quality is good. Are there problems from the SC's output?

No... I think you have a bad cable.

no noise here- you might get noise if you have a laptop plugged into the wall though (would go away if you unplug and run on battery).