Two-Rock Bi-Onyx Owner's Manual page 4

BOOST (Clean & Lead) - Adjusts a "Solo" option, increasing the volume of each channel. It does
not alter the gain or tone structure. These controls must be set to a level greater than the Master
Volumes to be effective. Both Clean and Lead Boosts are Foot-Switchable and can also be
activated by pulling out the Boost control knobs.
REVERB (Clean & Lead) – Adjusts the amount, or level, of reverb mixed back into the signal
path. The reverb effect is defeated with this control in the full counter clockwise position.
CONTOUR (Clean & Lead) - The contour control is an active wide band sweep. In the 12 o'clock
position, the amp's frequency response is flat. Counterclockwise rotation reduces high end
response and increases low frequencies. Clockwise rotation decreases low end and increases the
high frequency response. This control is very useful for maintaining preamp tone control settings,
while allowing a global adjustment to compensate for differences in room acoustics, speaker
cabinets, or bright to dark guitars (single coils to humbuckers, for example). This control also
actively reduces the articulation available, allowing a softer setting, or extremely open and
revealing, depending on your individual style and requirements.
STANDBY - This switch should be in the down/STANDBY position before you place the Power
switch to the up/ON position. After 20 seconds or more, place the Standby switch in the "up"
position to play the amplifier. When you are taking a break from playing the amp you can leave the
amp "powered up" and simply switch to the "stand-by" position to mute the output of the amplifier
and prolong power tube life.
LED INDICATORS - Dual Multi-color LEDs indicate amplifier power and channel/boost status:
Clean Channel (Upper Row of Controls)
Blue- Clean Channel is activated
Green-Clean Boost is activated
Lead Channel (Lower Row of Controls)
Red- Lead Channel is activated
Green-Lead Boost is activated