expression pedal with a switch to the EXP. SWITCH jack on the
rear panel with a mono (2 conductor) ¼” cable and press down on
the expression pedal, just like on a separate wah-wah pedal. For
this to work, the EXP SWITCH parameter within the EXP PDL
function must be set to WAH. The last way in which the WAH
function is turned on is by recalling a Preset with this WAH
parameter set to ON.
2. AUTO (OFF or ON): When OFF, it acts like a traditional wah with
manual control of the center frequency. When switched ON, it
enables the envelope follower (EF) to use the signal level to control
the center frequency.
3. EF DIRECTION (UP or DOWN): Setting UP means the center
frequency will sweep upward in frequency as the level you play at
increases. DOWN will move the center frequency in the opposite
direction.
4. EF GAIN (1 dB to 40 dB): Controls the envelope follower gain,
which increases the amount of frequency sweep. Typically set in
the 25 to 35 dB region.
5. WAH LEVEL (0 to +10): Controls the level near the center
frequency of the wah. Since the wah filters off frequencies away
from the center frequency, the audible level will typically go down
when the wah is switched in. This allows you to boost the level
back. Clean presets will require more boost, while higher gain
presets will require less because the increased harmonic content of
the distorted signal will tend to fall within the passband of the wah
filter.
6. WAH FREQ (250 Hz to 2000 Hz): The wah center frequency. A
wah-wah pedal is just a peaking filter with user variable center
frequency inserted in the signal path. This frequency can be
adjusted by turning the VALUE knob, but the usual method is to
connect an expression pedal which has a linear potentiometer (pot)
to the EXP. PEDAL jack on the rear panel with a ¼” stereo cable (3
conductor with ring-tip-sleeve or RTS plugs). The EXP PDL1 or
EXP PDL2 parameters must be set to WAH FREQ, and the
corresponding EXP MIN and EXP MAX parameters can be set the
the minimum and maximum frequency values you want to sweep
over. In this way you can limit the range to equal that of a classic
wah pedal if you wish. But the MIN and MAX values you set will
only be reached if the pot in your expression pedal sweeps from 0
ohms to the full maximum resistance of the pot within the pedal,
which often is not the case. So the actual MIN and MAX values
you reach may cover a slightly reduced range. See also the
EXPRESSION PEDAL Function.
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