Boss AW-3 Dynamic Wah Owner's Manual page 4

Panel Descriptions
6. BASS IN jack
This jack accepts input signal coming from a bass guitar.
* BASS IN is disabled when the GUITAR IN jack is used.
* When running the unit on battery power, the GUITAR IN and
BASS IN jacks double as power switches. Power to the unit is
turned on when you plug into the GUITAR IN or BASS IN jack;
the power is turned off when the cable is unplugged.
Be sure to disconnect any cord plugged into the GUITAR IN or
BASS IN jack when not using this effects device.
7. Pedal Switch
Used for switching effects on/off, and for inputting the tempo
(in Tempo mode: p. 10).
8. Thumbscrew
When this screw is loosened, the pedal will open, allowing you
to change the battery.
* For the procedure, refer to "Changing the Battery" (p. 14).
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9. DECAY knob
Adjusts the time over which the wah and humanizer effects
make the changes. Turn the knob clockwise to increase the time
that the effect plays.
10. MANUAL knob
Adjusts the frequency at which the wah effect begins.
* The range setting may vary with the selected mode and when
inputting through the BASS IN jack.
When in HUMANIZER Mode
Switches to VOWEL 2, in which the second vowel is selected.
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