RATE rotary control, which varies LFO"s frequency over a 250:1 range. * AMOUNT rotary control, which adjusts the amount by which the LFO output varies the phaser sweep. * SWEEP rotary control, which moves the phaser frequency response over a six-octave range. * RESONANCE rotary control, which adjusts the height and sharpness of the peaks of the phaser frequency response. * DRIVE rotary control, which adjusts the gain of the audio input to the phaser.