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SUPRO drive - Transformer Switch; Tone Control; Volume Control; Expression Jack

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The TRANSFORMER switch controls the
amount of dynamic range of the “power
amp” circuit. It switches between two sec-
ondary coils of the output transformer. The
RICH mode gives you a more compressed
and gained up sound. The BOLD mode
gives you more headroom and punch to
your tone.
The TONE control sets the cutoff frequency
of a passive low pass filter at the output
of the “preamp”. When the knob is fully
clockwise, there is no effect from the filter.
As you turn the knob counter - clockwise,
the filter will cut more treble frequencies.
The VOLUME control sets the overall output
level of the effect.
The EXPRESSION jack accepts a 1/4” TRS
cable from a standard expression pedal.
This controls the gain of the “preamp”.
The heel-down minimum gain can be set
with an internal trimmer. The GAIN control
will set the maximum gain. Be sure to have
the expression.

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