Peavey Vypyr analog mods

[screamersusa]

I've already fuddled around with this a little.
While it's not really a pedal, its a pedal type question.
The peavey vypyr dsp main board (same for all amps) has an analog transistor based distortion.
Frankly I can't stand the tones sometimes. I cut the high end on the last op amp,
added a level dropping pot between the two stages. tweaked the low end a tad. Better.

I think it might be nice to "alter" this circuit to make a more usefull in amp distortion.
In particular the Diezel sim is ch2 and 4, not ch 3. By altering the analog circuit I found
we can get it to sound way better.
Maybe even replacing the second stage with a bs170 circuit?
Perhaps someone could take a look at the schematic and explain it.
It's the TT gain circuit.
Thoughts.

[screamersusa]

I forgot I raised the gain on the first stage with very nice results, then lowered the second stage
input level.

[teemuk]

Perhaps someone could take a look at the schematic and explain it.

All TransTube analog circuits are patented and the documents explain very well how they work.

Google patents search can find the documents in a heartbeat.