Some recent threads rekindled my interest in Joe Davisson's circuits, the first thing I threw on the board was his original Vulcan and it sounded great.
Lots of range from sparkly to saturated, tons of extra volume available. I decided the first thing to add was a simple Rat Filter, then some extra clipping diodes on a switch.
I also added a resistor (5K6 R20) to keep the distortion control from going all the way off.
Finally some tone changing filter caps to block some unwanted noise and radio stations and these are the caps in question.

C11 (2n2) helped block unwanted extra noise coming in and changed the tone in a nice way but is there another way to do the same thing here? What have I done here? It sounds good, so is it good?

C7 (47p) blocks out the radio station and doesn't seem to have any affect on the overall tone, but it works anywhere between C2 and C4. Is there any "best" place to put it?
All diodes are 1N914 and transistors are 2N5088
