K&M Analog Designs Two-Rock Onyx Owner's Manual page 4

7/14 REVERB- MIXES- the dry signal with a high quality spring-type
reverberation effect. This effect is defeated with the control in the full
counter-clockwise position. The reverb levels are completely independent.
8/15. PRESENCE CONTROL- Adjusts the contour of high-frequency
response. The high-frequency response will increase as you advance the
control clockwise.
16. STAND-BY SWITCH- Should be in the "down" or "stand-by" position
when you apply power to the unit. After a few seconds, place the switch in
the "up" position to use the amplifier. You may leave the unit "powered up"
and place this switch in the "stand- by" position to mute the output.
17. INDICATOR LAMP- This lamp will illuminate when the power switch is in
the "up" position, indicating the unit is receiving A/C power.
NOTE: All switches are ON in the "up" position.
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