Boss AW-3 Dynamic Wah Owner's Manual page 10

Description of Each Mode
7 TEMPO
In this mode, you can specify the tempo of the auto wah in a
range of 200 msec to 4 sec by using the AW-3's pedal switch (p.
4) or by using a foot switch made by BOSS (p. 13).
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Tempo Settings with the AW-3 Pedal
1. When you have finished making the connections
(p. 6), press and hold down the AW-3's pedal
switch for at least two seconds to enable setting of
the tempo (the CHECK indicator turns green, and the
tempo flashes in red).
The output sound also switches to Auto Wah at the same time.
* When the power is turned on (before tempo settings), the
tempo is at 500 msec.
* To allow switching without the normal stress of dealing with
effect on/off hassles, when you go into the tempo setting
mode with the effect on, the effect is switched off for two
seconds, after which the AW-3 switches to the tempo setting
mode.
2. Depress the pedal to get the tempo you want.
The speed changes to match the tempo entered by pressing the
pedal, and the CHECK indicator will flash in sync with the tempo.
Available range for the tempo: 200 msec–4 sec
3. With the DECAY knob, adjust the wah effect time.
4. When you have finished setting the tempo, once
again step on the pedal switch, and keep it down for
two or more seconds.