1) Guitar Input - this is a 1/4" 2 conductor input jack for plugging in your instrument. It is intended for bass guitar or Hi-Z microphones but will accept other instruments as well.

2) Volume Level - this control is the output volume control for the bass guitar input. Slowly increase the control to increase the volume. If you are using a bass guitar with an on-board preamp, set it's level for a mid position before increasing this control otherwise distortion may occur.

3) Low - this control is the bass control. It is passive and set to shelve frequencies at 100 Hz. This will effect the low frequency signals. Turning it fully clockwise, the signal is basically left alone. Turning it counterclockwise, the low will be rolled off -12db. Especially good for making low output, thin toned bass guitars sound fuller.

4) Mid - this control is hte Low Midrange control. It is passive and set to shelve frequencies at 500 Hz. This will effect the mid-low frequency signals. Turning it fully clockwise, the signal is left alone. Turning it counterclockwise, the highs will be rolled off -12db. This will add or subtract the high end attack of slapping style sounds or pick attack and clarity.

5) High - this is the high frequency control. It is passive and set to shelve frequencies at 3KHz. This will effect the high frequency signals. Turning it fully clockwise, the signal is left alone. Turning it counterclockwise, the highs will be rolled off -12db. This will add or subtract the high end attack of slapping style sounds or pick attack and clarity.

6) Headphone Jack - this is a 1/4" 3 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.

8) Power LED Light - this LED light lets you know that the amplifier is on.