When using the pw-1 with a Power supply theres no wah effect when moving the pedal.. If you unplug the power and continue to move the pedal you can clearly hear the wah effect before it fades out (due to the removing of the power)..
The power supply section of the PW-1 seems similar to the PD-1. I own a PD-1 and drew the schematic for it : the power supply is more complicated than usual ACA compact pedals. Grounds of signal and power supply are separated. If you're using a daisy chain that could explain.