I've got my Stomp hooked up via 4CM to my Mesa Boogie DC-3, utilizing the effects loop on the amp. The amp has a mix % and the Stomp's FX Loop block also has a mix %. Before the Stomp, I would have my pedals run into the effects loop, and would have the mix % at 100. When I started playing with the Stomp, everything sounded terrible. It was all distorted, like the signal was too hot. After trying everything, I turned down the mix % on the FX Loop block to 0, while keeping the Boogie's mix at 100. Once I did that, everything sounded perfect. But oddly, the effects were still playing.
This makes no sense to me. If the mix % is 0 on the Stomp, doesn't that mean all dry, no effects should come through at all?
Do I have something set up wrong with the cables? I followed the directions for 4CM in the manual, so I've got Guitar -> L Mono in; L Mono Out -> Amp Return; Amp Send -> Return L Mono; Send -> Amp In