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Panel Descriptions
Front Panel
[MID BOOST] Button
Turns the midrange boost on/o.
[BASS] Knob
Adjusts the sound level of the lower range.
[MIDDLE] Knob
Adjusts the sound level of the midrange.
[TREBLE] Knob
Adjusts the sound level of the upper range.
INPUT Jacks
Use to connect to an electric guitar. Use HIGH or
LOW according to the guitar’s output level. Normally
connect to HIGH. Especially for guitars with a large
output and likely sound distortion, connect to LOW.
[MANUAL] Button, [CH 1]–[CH 4] Buttons
Each knob on the front panel of GA-212/GA-112 has an original LED pointer that allows you to check at a
glance the settings during a performance or when the channels have been changed.
The simply-structured operation system enables intuitive control.
[MANUAL] button
When the unit is turned on, MANUAL operation is activated.
In MANUAL operation the LED pointers and knobs always match.
Knob LED pointers
An LED pointer indicates the setting of a knob.
When any one of the [CH 1]–[CH 4] buttons are pressed to change the
channel (settings), the knob LED pointers also change instantaneously.
When the [MANUAL] button is pressed, the LED pointers will be displayed at the current knob
positions.
If the saved knob setting is at the maximum level and the knob position is at the
minimum level, turn the knob clockwise before making adjustments to lower
the set value.If the opposite is true, turn the knob counterclockwise before
making adjustments to raise the set value.
PROGRESSIVE AMP
PROGRESSIVE AMP is an original amp
designed with the very latest COSM
technology. By changing the preamp and
power amp behavior, you can freely create
a broad range of sounds.
[DRIVE] knob/
[BOOST] button
Adjusts the level of distortion.
[BOOST]
button
[DRIVE] knob Operation
Minimum Value to Maximum
Value
OFF Clean to Crunch
ON Crunch to Super Extreme
* When BOOST is on, the expression pedal
connected to the DRIVE jack of the exclusive
foot controller ( p. 8) can change the sound
from clean to super extreme.
[VOICE] button
Changes sound character.
[VOLUME] knob
Adjusts the volume.
Sound indicator
When distortion is adjusted with the
[DRIVE] knob, the sound indicator color
changes according to the level of the
distortion. (If you don’t want to use the
LED display, for example, on a dark stage, it
can be turned o.)
To make the setting, see
p. 10