Rocktron R20 - Manual (Page 6)

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Front Panel
1 INPUT jack
Connect your guitar output to the 1/4" input jack with a shielded guitar
cable.
OVERDRIVE GAIN control
Adjusts the amount of amplification in the preamp when the
OVERDRIVE channel is active. Turn the knob clockwise to increase
distortion.
OVERDRIVE LEVEL control
The LEVEL control adjusts volume in the OVERDRIVE mode. Once
GAIN is set, adjust the LEVEL control to a reasonable practice
volume.
OVERDRIVE button
When pressed IN, the OVERDRIVE mode is engaged.
CLEAN LEVEL control
When OVERDRIVE is NOT active, this is the volume control for the
CLEAN setting.
EQUALIZER - TREBLE/MID/BASS controls
Tone controls, or EQ. BASS raises or lowers the low frequency
sound while TREBLE does the same for the high frequencies. MID
adjusts mid-band frequencies.
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