Reparation

The "drive knob" on both parametric and graphic eq is a internal level match, to get best headroom/signal to noise in the eq boost/cut amp section. This "drive knob" is a dual potentiometer there one half are connected around the amp before the eq section, and the other half connected around the amp after the eq section, and when you "drive" you increase the gain in the input amp, but in same time you decrease the gain in the output amp with same value. So the result is that you can not hear any gain change when you turn the "drive knob" from end to end, but you change the headromm in the eq section."