Boss V-Wah PW-10 Owner's Manual page 16

Operation
VOICE Type Played
WAH RANGE
LO
HI
16
MIN Pedal
ui i
oe e
ua a
i e
u a
o i
u i
o e
u a
o i
u e
MAX Remarks
ia Talking modulation-like sound
ea
ai
a Realistic human voice
i
e
a
i
o
a
i