a combination of a tremolo and a wah wah pedal
https://www.zvex.com/custom-store/ooh-wah
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ZVex Ooh Wah in Mint Condition with original box, etc The Ooh Wah is a wild one. The Zvex Ooh Wah is a tremolo/wah pedal with a programmable sequencer for cycling through either all eight steps, six steps, or down to just four steps. A knob for speed is also provided as well as a random mode for maximum experimental space ship weirdness.
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