Behringer HB01 Hell Babe,Amazon.com: Behringer HB01 Optical Wah Pedal for Electric Guitar, Adjustable Frequency Range, Spring-back Mechanism, Fine-tune Control : Musical Instruments,Amazon.com: Behringer HB01 Optical Wah Pedal for Electric Guitar, Adjustable Frequency Range, Spring-back Mechanism, Fine-tune Control : Musical Instruments,Amazon.com: Behringer HB01 Optical Wah Pedal for Electric Guitar, Adjustable Frequency Range, Spring-back Mechanism, Fine-tune Control : Musical Instruments,Amazon.com: Behringer HB01 Optical Wah Pedal for Electric Guitar, Adjustable Frequency Range, Spring-back Mechanism, Fine-tune Control : Musical Instruments