Fulltone Clyde Standard Wah

Classic wah pedal, modeled after those used by Jimi Hendrix and Eric Clapton in the 60s.
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Here's Jeff's signal chain, from the 2011 Kaleidyscope tour [article]:

Guitar -> Fulltone Clyde Wah -> Loop 1: Mad Professor Forest Green Compressor (my favorite compressor), Tone Freak Naked OD, Tone Freak Abunai II OD, Instruments for a New Electric Music Compact Faye Sing Phaser, Analog Man Chorus, Boss PS-5 Super Shifter ->

Loop 2: Boss RE-20 Space Echo, Eventide Time Factor Delay, Eventide Space ->

Loop 3: Line 6 M13 -> Amp