Yeah tried to mention that in my comment. You were switching between 3 physical caps, but the transistor(s) in the wah circuit let you use a potentiometer to al

Yeah tried to mention that in my comment. You were switching between 3 physical caps, but the transistor(s) in the wah circuit let you use a potentiometer to alter the way the cap reacts in the circuit by reducing the sheer number of electrons that even get stuck on it.