Aguilar Grape Phaser Simple, Two-Knob Analog Bass PedalThe Aguilar Grape Phaser Bass Pedal provides lush, analog phase shifting courtesy of a simple, two knob layout. From flowing, liquid tones to fat, funky ones, this simple phaser has a wide range of usable sounds in it. Fantastic for all styles of playing, especially soloing, fretless, and slap. Rate controls the speed of the modulation while Color feeds a portion of the signal back through the phase shifting circuit, creating new and super funky bass