Harley Benton HB-80R User Manual page 16

Connections and controls
1 [INPUT]
1/4" jack socket to connect your instrument.
You can also connect other active signal sources like CD or MP3 players, keyboards, mixers etc. to this input.
2 [GAIN]
Control to adjust the preamp gain of the signal in channel 1.
3 [VOICE]
Control to adjust the tone colour of the signal in channel 1.
4 [BASS]
Control to adjust the low frequency of the signal in channel 1.
5 [TREBLE]
Control to adjust the high frequency of the signal in channel 1.
6 [VOLUME]
Control to adjust the volume of channel 1.
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guitar combo