Two-Rock Sensor 22 Owner's Manual page 4

Expansion/Pull On - Pulling the knob engages the Expansion circuit. This feature cuts the EQ
section out of the signal path allowing more input signal to hit the gain stage. With it engaged it will
allow the natural frequencies of the input tube and guitar to come through. This adjustable control
allows how much gain passes through and as it is turned up (clockwise) it will increase the amount
of high and mid frequencies. When engaged with the lead channel on, this allows the internal post-
gain EQ to be isolated. Expansion function is foot-switchable and the push/pull control
needs to be in the "In" position for the footswitch to work.
Master – Clean - Adjusts the overall output level of the amplifier. At lower settings on this control
the amp will be much cleaner sounding as well as lower in volume. As this control is turned up the
power section of the amp begins to work harder which increases sustain, fullness, and touch
dynamics as well as increasing the volume of the amplifier. At higher settings on this control the
power section will be pushed into natural overdrive especially if the Gain control is set higher.
Master – Lead - Adjusts the output level of the lead channel. Pulling the knob engages the lead
channel. Lead function is foot-switchable and the push/pull control needs to be in the "In"
position for the footswitch to work.
Contour Clean - 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.
Contour Lead – Same as above but independently affects the lead channel.
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.
Indicator Lamp - This lamp will illuminate when the rear panel power switch is in the "up" position,
indicating the unit is receiving A/C power.