1) Input Jack - this is a 1/4" 2 conductor input jack for plugging in your instrument. It is intended for guitars but will accept other instruments as well.

2) Drive Switch - this switch turns the overdrive circuit on or off. When engaged the gain control then determines the amount of distortion added to the sound.

3) Gain - adjust this clockwise to increase the amount of distortion you add to the overdrive signal. Used in the lower ranges of the control, you get less distorted sound, a "bluesy" tone. As you increase the gain, you add tremendous amounts of distortion to the signal for a harder edged "crunch" tone.

4) Voice - this is an overall tone control. It is a specifically designed control that in the extreme counter-clockwise position, will give a full bodied sound with lots of midrange tones. By increasing this control, you proceed to boost the bass and treble regions but reduce the midrange content of the sound.

5) Volume - this control is the output volume control for the entire amplifier. It follows the tone circuit.

6) Headphone Jack - this is a 1/4" conductor jack for plugging headphones. It will sum the signal and put the sound in both ears, thereby creating a pseudo-stereo sound. Volume will be determined by the volume control on the channel you are on. It will disconnect the internal speaker when plugged in. This will allow quiet practicing.

7) Power - this switch turns on and off the AC power to the amp.