Harley Benton CG-15 User Manual page 26

Components and functions
7 [TREBLE]
Treble control of the 2-band tone stack.
8 [BASS]
Bass control of the 2-band tone stack.
9 [GAIN]
Use this control to adjust the input gain. The dial shows 3 areas for the corresponding sounds: 'Clean' - delivers clean
sounds, 'Driver' - for bluesy crunch sounds and 'Dist'(ortion) for fat overdrive sound.
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guitar combo