Rocktron VooDu Valve Online User Manual page 24

The WAH-WAH function is available only in configurations which display "WAH" in
the configuration title.
The Voodu Valve has an internal wah-wah which allows for an expression pedal to be
used as a wah-wah pedal through continous control changes. Use of this feature elimi-
nates the need to run long audio cables out to a conventional wah-wah pedal.
To use an expression pedal as a wah-wah pedal, connect it to a MIDI controller (such
as a Rocktron MIDI Mate™) and set the controller's MIDI channel to correspond with the
Voodu Valve's receiving MIDI channel. Then set the pedal's control number on the MIDI
Mate™ to match the Wah Frequency parameter's control number on the Voodu Valve.
This control number is set on the Voodu Valve in the "CONTROLLER ASSIG" function.
(See "Controller Assignments" in Chapter 8 for more information on assigning control
numbers.)
The PARAMETER SELECT control will allow you to access these WAH-WAH parameters:
WAH-WAH I/O The WAH-WAH I/O parameter determines whether the wah-wah is
active for the current preset.
WAH FREQ The WAH FREQUENCY parameter allows you to manually sweep the
frequency range of the wah-wah via the PARAMETER ADJUST
control. Selecting a frequency for this parameter and storing the WAH-
WAH parameter IN allows you to use the wah-wah as a fixed wah.