K&M Analog Designs Two-Rock Topaz Owner's Manual - page 6
7. EFFECTS RETURN- Use this jack to connect the output of your effects to the
amplifier.
8. EFFECTS LEVEL- Adjusts the return signal level. It also acts as a master
volume control. Do not set fully counter-clockwise, as this will shut off signal
to the output section, resulting in no output level. Normally this control
should be set at the 12 o’clock position.
9. FOOTSWITCH JACK- Connect the foot switch assembly here to enable
remote switching of the lead/rhythm and bypass functions
10. HARMONICS - This switch defeats the internal feedback circuit located in
the preamp section. The effect is subtle; you will notice a slight increase in
high and low frequency response and a decrease in dimensionality and
articulation.
NOTE: Both the “Lead” and “Bypass” front panel switches must be
in the “down” position to enable footswitch function.
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