Thanks JJIt occurs after the amp so it doesn't affect the way the amp saturates, but it will affect the way the cab block will sound. It is dependent on the motor drive level and the signal level of the input into the cab block I believe. It simulates the effect of what happen when you send high power levels to the speakers (clean or saturated).
So putting a booster after the poweramp I could benefit of both a clean amp and a non linear cone? Or is this impossible to setup?