BOSS AW-3 Dynamic Wah

They say:

The BOSS AW-3 Dynamic Wah gives guitar and bass guitar players a wide range of classic auto-wah and dynamic wah effects, with seriously funky wah sounds for bass. Choose between fixed and auto wah, or add an optional expression pedal. There is also a new "Humanizer" effect which can simulate human-voice type vowel sounds! 

This pedal can be controlled automatically via a tempo control, or externally using an expression pedal. 

BOSS AW-3 Dynamic Wah Auto Wah Guitar Effects Pedal Features:

• Dedicated inputs for both guitar and bass
• Fixed or auto wah settings
• Can be controlled via tempo control or optional expression pedal
• "Humanizer" effect gives you vocal-style sounds
• Compact, durable metal chassis