I have a delay pedal producing echos, but I only hear the echos when I'm hitting notes: the echos get muted as soon as I'm not hitting a note.
The same thing happens with my Looper pedal: I can't hear the playback except when I'm sending an input signal to the KPA.
This is pretty strange behavior.
Thankfully, I discovered that the Distortion Loop does not exhibit this behavior, so I seem to be okay for now, but I'm missing the logic here.
The Manual states the the Mono and Stereo Loop are suitable for all non-distorting effects, but this is clearly not true.