The Boss AW-2 gives you a range of Wah effects. You can get a dynamics-sensitive Wah that changes with the strength of your signal, and automatic Wah over a cycle of modulation. If you combine the two you can get an extra powerful effect, and you can also set the frequency point of the Wah to customise your tone. The latest version of this pedal is the AW-3 which has a new “Humanizer” effect which can simulate human vowel sounds. A Bass input provides a variety of funky wah sounds for bass guitar.