Walrus Audio Polychrome Analog Flanger Effect Pedal - UsedThe Poychrome from Walrus Audio is a fully analog flanger. The rate and depth knobs give you control over the speed and intensity of the effect. Sweep will adjust the frequency range and Feedback will feed the flanged effect back into the signal for dramatic sounds. Excellent condition. The edge of the knobs of the pedal have some cosmetic wear, particularly the rate and depth knobs.