I've got a hum when my CMOY is silent.   I'm fairly certain it's a ground thing because I can eliminate it entirely if I touch the 3.5mm jack and the outside of the case.   nb. I have a cable that ends in a gold connector (metal) and that's what I'm touching.   It's a ground loop...

I built a cmoy, and I'm pretty happy with it. However the plan was always to use the cmoy as a precusor to building an o2, but now I'm wondering if I'd benefit from buying a dac that takes optical in, instead?   I use a PC (Audigy 2zs)> cmoy > Ms-1i. 

I built my first amp today, a cmoy. Now I'm testing it with some music, and every few minutes the music goes REALLY quiet. If I turn it off and on again, it's fine. What could be the problem? I guess it might be the potentiometer? Has anyone experienced this before?