C5 increased bass, from 470nf to 1uf. Maybe nice to have as a bass switch.
Ic, r12, gain pot didnt do much tbh. Removing r9 rendered the gain pot useless but increased the gain by a small amount.
I didnt want to removed the clipping diodes as i feel it may reduce the touch sensitivity to the circuit, and i like how they sound. In that asymmetrical way.