I know, I know. Bear with me, I've done some research on this already...
I have some pedals I'd like to use with the Kemper. And because I'd like to sometimes reamp over spdif, the FX loop is perfect. I have tried both loop mono and loop distortion, and I have the fx loop in stomp B. Every time I have engaged the loop, I have raised the noise floor. It goes from fairly quiet to fairly hissy. Like a live tube amp, just "fscccccccccccccccchh". It's so loud that it's barely covered when there is actual signal. So practically useless...
Now I thought that, since I use gain pedals, it's perhaps a gain staging issue. So I've think I've ruled out most of it: I've checked clean sense (it is properly set as per instructed so it's not to low), I've checked cables, volumes, settings, even switched pedals and what not. So I did something that ckemper recommended in another thread here: I put a cable from the send to the return in the back of the Kemper without anything attached and it still hisses. So naturally, I changed cable and tried again. Still does the same thing.
But here is the kicker. It's noisy and starts to hiss when I engage the loop, even with no cables attached at all. No cables, just pushing stomp b on and off makes hiss come and go. So I'm stumped. What am I forgetting or doing wrong here? Anybody?
(can post audio files, just give me a few hours).