Clean Compensation
When Clean Compensation is set to maximum, the natural loss of volume of the amp PROFILE is compensated as the amp gain is dialed towards clean sounds. Amp volume is simply increased with decreasing gain settings, without further coloration of the sound. This reduces the need to re-level clean sounds for live performances. Most PROFILEs have Clean Compensation set to maximum.
By reducing Clean Compensation, you can lower the compensation to zero to achieve a natural gain behavior. This is recommended when using a distortion effect in front of an amp, and you’re aiming for that classic boost effect when engaging the distortion.
- from the manual