The 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 sounds. The pedal is powered by a universal 9-volt power supply only. Not included. It uses all-analog technology, and 1/4-inch input and output jacks.