Originally Posted by A-train
I didn't get where you thought John M's reply was saying that your settings were wrong. He simply pointed that the pedal you were using was doing what it was designed for which in that particular setting was squashing the low end of your sound. I thought he gave good advice based on what you said it was doing to give you back your lows. I understand that your going for a certain sound though. Perhaps you should try something like a boss bass limiter. It doesn't really squish much but it does add presence.
That pedal, regardless of how it's set, has a known inherent nature to cut off low end. Even set with the sensitivity off and matching the volume to the unaffected volume, just clicking on the pedal creates an audible reduction in low end.
A compressor reduces dynamic range. Reducing dynamic range has nothing to do with frequency reduction!