More Distortion From This Amp? - Schematic Attached

[Dino Boreanaz]

After initially thinking there was something wrong with this amp, it does seem to be working just fine - it just doesn't have any breakup at reasonable home volumes.  So I'm looking for your thoughts on whether it is possible to get a more over-driven sound (distortion, fuzz, dirt, overdrive, gain) from this amp.  If so, what specific changes would you recommend this electronics novice start with?

[Enzo]

I'll stick with my earlier suggestion:  covert the front end to the guitar amp circuit from your multi-model drawing.

[Katoda]

If you are just after more distortion, maybe stick some antiparallel diodes in the first op amp feedback loop, or put in a fet boost as the input.