I recently added a dbx 166xl to my setup, and it seems to add a lot of hiss to the signal. Is this normal? I was just using a pedal limiter before, so I'm not savvy on rack compressors. But when I hit the bypass switch on the compressor, everything is nice and quiet. Turn bypass off, and there's the hiss. Not a big deal when I'm playing at volume, but I hate the idea of adding noise to my signal. I love the compressor otherwise. I have the gate off, and I have moderate compression settings, nothing radical. Output gain at +8 or 10 to match gain reduction, limiter off (I think, I'm not at home right now), using soft knee compression. Am I doing something wrong? My path: bass -> eq pedal -> sansamp psa -> 166xl (in effects loop of sansamp) -> power amp -> cab. No hiss problems before when I had a limiter pedal after the eq pedal and nothing in the sansamp effects loop.