This verstile envelop filter will give you unbelievably funky autowah effects.
The Electro-Harmonix XO Q-Tron is an envelope filter guitar effects pedal that has a switchable boost. The Q-Tron pedal's filter modes deliver an unlimited supply of new auto-wah effects that drip with attitude. Increased frequency response and improved signal-to-noise ratio make the Electro-Harmonix Q-Tron envelope filter pedal perfect for use with any instrument. Bootsy Collins and George Clinton already have theirs. How about you?