Bodyrez piezo enhaning pickup. My Martin actually sounds pretty good, but I also have piezo pickups in 2 electrics, which could use some assistance in the authenticity department. Col M. gave this a good review and it is quite hard to find a bad one. It even comes with a power supply. It retails...
The gain structure/tone/breakup point/distortion level (or any other term you choose to use) of an OD, distortion or fuzz type pedal certainly changes when you add compression.
This may be obvious to some and not others. Myself, I always assumed this in theory but finally put it to the test...