DigiTech CM-2 - Manual (Page 7)

What Does This Do?
Level Knob - Controls the overdrive output level. Turn the knob
clockwise to increase and counter-clockwise to decrease the output
level.
DC Adapter Jack - Connect (an optional) Harman PS200R
power supply to this jack. Use the proper supply for your area’s
mains line voltage.
Low Knob - Controls the level of low frequency (bass) boost/cut.
Turn the knob clockwise to increase and counter-clockwise to
decrease bass level.
High Knob - Controls the level of high frequency (treble) boost/
cut. Turn this knob clockwise to increase and counter-clockwise to
decrease treble level.
Gain Knob - Controls the overall overdrive gain. Turn the knob
clockwise to increase and counter-clockwise to decrease the
amount of overdrive gain. 1.
2.
3.
4.
5.