Basically my mashup of several amp/cabsims, reduced to the simplest possible version that still has a great (looking) frequency response and can provide ~30dB of clean gain or provide a touch of clipping at max.
First a non-inverting op-amp gain stage, followed by an active low pass 2nd(3rd? 4th?) order Sallen Key filter with gain and a bridged-t in the feedback loop for a peak right before the cutoff, as well as an extra low pass pole/voltage divider (ripped from the Sansamp GT-2). Can be a clean boost to overdrive a stage harder or can be dialed back to sweeten up a clean sound, or even to go direct to a mixer/PA/whatever.
Biased via diodes instead of classic voltage divider
