"Built to Michael’s exact specifications. True by-pass switching, input buffer, yellow Fasel inductor. External gain control for traditional or modern hi-gain wah sounds. LED on/off indicator. Custom hand painted blood splatter finish, each one is different and unique. Available now! Email for ordering information. Sound samples coming soon."
http://www.homebrewelectronics.com/products/michael-amott-signature-wah
http://www.homebrewelectronics.com/products/michael-amott-signature-wah