Err, the more distorted a signal is, generally, the more compressed it will be naturally as that is what distortion IS. ( I assume we are talking harmonic distortion as related to guitar amps.) I don't mean to be a dick, but you might want to do some reading up on the physics of this stuff. Do a Google on harmonic distortion, voltage rails, square waves, read an article or two on gain staging, learn about impedance, and maybe even vacuum tubes. Once you know the hows and whys behind a lot of these things, it makes it much easier to work with it. You're just asking servely newbie questions, a few minutes fo Google and reading will probably tell you more than we could in months as right now you don't even know the questions to ask.