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While Thumperjack is a font of misinformation he is somewhat correct. The classic Vox-style wah has a complex input impedance that is dependent on the pedal position.
Modelers cannot reproduce this since they necessarily have an input buffer.
Later wahs like the Cry Baby GCB-95 contain an input buffer and do not suffer from this.
IIRC you can get close, though, by simply reducing the input impedance. The load is mostly resistive and around 100K I believe. I would have to go back through my notes and simulations to get the actual numbers.
Modelers cannot reproduce this since they necessarily have an input buffer.
Later wahs like the Cry Baby GCB-95 contain an input buffer and do not suffer from this.
IIRC you can get close, though, by simply reducing the input impedance. The load is mostly resistive and around 100K I believe. I would have to go back through my notes and simulations to get the actual numbers.