Im having a problem with the bypass switch on a dbx 1066 compressor that’s in the fx loop of my svp pro pre amp. Initially I was running bass>compressor>pre and always had a rough time with pumping. At this time the dbx bypass switch would work as one would assume it would, giving me a effected and non effected signal path depending on Position if switch. After some reading on line levels I decided to go with the dbx in the Fx loop, which made for a much better sound and responsiveness to the comp, however now when I engage the bypass it acts as a mute and completely cancels all signal. What could cause or remedy this?