Roland VG-88 Quick Start Manual page 4

Using the expression pedal (using the wah pedal)
The built-in EXP pedal can also be assigned to parameters other than volume.
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4
1.
Make sure you're in Play mode.
If you're not in Play mode, press [EXIT] several times.
2.
Press [EFFECT].
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3.
Press [F2] (ON/OFF) to turn WAH "ON."
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4.
Press [F5] (EDIT) to access the WAH EDIT screen.
5.
Press [F1] (TYPE).
6.
Turn [VALUE] to select "PEDAL WAH."
7.
Press [F6] (SET PDL) to assign WAH to the built-in EXP
pedal.
* If you wish to save the sound, perform the Write operation
(Owner's Manual; p. 25).