Another word for these guys is envelope filter. What is basically does is this: You have an envelope shape, like in a wah pedal (a nice resonant peak). Now what happens next is that instead of your foor controlling the wah now your volume controls the wah. So the louder you play the more 'toe down' you go. In most of these pedals they incorporate some controle like sensitivity and decay. This allows you to control at what volume the wah goes 'toe down' and how long it takes to get back to 'heel down'.
No problem
I guess there are some technical details to how you can make a pedal sound like an automatic wah. The guys from the funky monkey and snow white did it in a technically different way, also making it sound a little bit different, but both the envelope filters and other clever ways (like with a LFO) to create the dynamics or volume depended reponse give a comparable sound in the end, which in general the best name is auto-wah. Also see this wikipedia page
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...but both the envelope filters and other clever ways (like with a LFO) to create the dynamics or volume depended reponse give a comparable sound in the end, which in general the best name is auto-wah. Also see this wikipedia page
