Bit confused...  I'm using the effects loop for a looper, and with some patches, there is some clipping noise when going through the effects loop and looper...  Ex:   1) I go to patch one, activate the effects loop, record a phrase though the looper, all is fine. 2) I switch patch, play a bit, sounds fine. 3) I activate the effects loop, the looper plays fine. 4) I play, but now I'm getting some clipping noise (not from the looper, but from the current guitar/patch sound