VOLUME: output volume control.
GAIN: gain control.
TONE: passive tone control.
XBASS: control of low frequency crossovers stage distortion.
FEEL: three position switch that gives three different levels of compression. CENTER = OFF, DOWN = LOW COMP, COMP = UP HIGH
REMOTE: latching Tip-Sleeve contact for remote bypass.
Power: ONLY 9VDC / 50mA