The Keeley Electronics Phaser is a 6-stage phase shifter that features a true-bypass analog circuit based on OTA ICs (Operational Transconductance Amplifier Integrated Circuits). OTA-style phasers are known for their shimmery characteristics and lush sound. The Keeley Phaser is the first OTA analog phaser with two control modes: Tap tempo and Leslie-style ramping that allows you to merge seamlessly between two different speeds. In Tap mode, tapping a tempo on the footswitch or adjusting the speed knob controls the phase rate. When using Ramp mode, the second footswitch changes between fast and slow speeds. Users can either switch between two speeds instantly or gradually go between the two speeds. Ramp mode emulates the brake on a Leslie in terms of the phase speeding up and slowing down. The pedal consists of Edge and Ramp knobs as well as Fast and Slow speed knobs. A mini-toggle switch lets you choose between Tap and Ramp modes. Besides an on/off footswitch, there is a footswitch that performs double duty as a Tap Tempo in Tap Mode, and a switch between Slow and Fast in Ramp Mode. The LED lights on the pedal indicate when the pedal is on and what mode you are in, and blinking LEDs indicate the speed of the phaser. -> 9V power supply NOT INCLUDED. Video sample: https://www.youtube.com/watch?v=TxosJ9pQ9Cc