Boss BR-1200CD Owner's Manual page 312

Insert effect parameter functions
Frequency
Adjusts the center frequency of the wah effect.
Peak
Adjusts the way in which the wah effect is applied to the area
around the center frequency. Lower values will produce a wah effect
over a wider area; higher values, a wah effect over a narrower area.
When the setting is 50, a standard wah sound will be produced.
* With a value of "50" a standard wah sound will be produced.
Level
This parameter adjusts the volume.
● When "PEDAL" is selected
The effect of the wah pedal can be reproduced by operating an
expression pedal.
For a more detailed explanation, see "Using an expression pedal" (p.
124).
Peak
Adjusts the way in which the wah effect is applied to the area
around the center frequency. Lower values will produce a wah effect
over a wider area; higher values, a wah effect over a narrower area.
When the setting is 50, a standard wah sound will be produced.
Level
This parameter adjusts the volume.
312
0–100
0–100
0–100
0–100
0–100