I was playing my Prophet 6 today and I noticed that some patches are extremely quiet. Despite moving the volume knob or program volume or any of the knobs it's extremely quiet on certain patches. I'm looking at the levels on the input on my recorder and it's picking something up but I just can barely hear it if at all. I adjusted the recorder a little bit but even still..when I initialize a louder patch it suddenly decreases in volume. Is there something I can do with the calibration or in Global Parameters to fix this?