Schematic:
layout
I extracted the modulation portion of the Zero Point Mini delay pedal from Madbean. I really love the sound of this modulation!
The only part I'm not sure about is Vc in the schematic. Do i need that 47R resistor between the 9V and Vc?
The switch can be:
SPST if you only want to turn the modulation on and off (I think the LED keeps flashing even if the modulation is turned off.
DPDT if you want to turn the LED off when the modulation is off (toggle or stomp (or 3PDT stomp and don't use one pole))
Pretty sure this should work. If I have time i'm going to give it a try this weekend.