On 1:00 in the Video you can see Frank using a Maestro Boomerang Wah. He also said this in an interview: "Which one to use depends on what kind of sound you want. They all have different responses. In the very beginning I used the original Vox pedal, and then later I moved to the Boomerang, because when I didn't have the guitar with the pre-amp it added a certain amount of distortion, and I liked that. I'll be using a Boomerang tonight. " ( http://wiki.killuglyradio.com/wiki/Shut_Up_And_Play_Your_Guitar ) - That is the Guitar Player interview form 1977 (May-June), written downj on the Zappa Wikimore
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