Ey thanks guys! I think the Shoot the Moon could be the one I'd try. Is the volume pot needed? I would like to make a 3 knob tremolo if possible.
No, you can replace the gain pot resistance in the feedback loop of the second IC audio stage (that sets the output level) with a trimmer, or install a socket for a fixed resistor so you can swap for a different value if it's too loud or too quiet.
If you look at the tagboardfx layout page for this pedal, there is a two-knob version (gain and waveshape omitted): Just build this but use a 470/500k linear pot instead of the thee-way wave switch+fixed resistor array (connecting the pot lugs 1, 2, 3 in place of switch lugs 1, 2, 3)