Changes

''Wah Pedals'' are named for the distinctive "wah wah" sound they produce. Essentially a wah pedal is simply a band-pass filter with its center frequency manipulated by rocking the pedal. This focuses the guitar tone on a certain range of the harmonics of the direct guitar signal. When used in front of distortion, it not only produces the characteristic "wah" sound, but can also be used to change the nature of the distortion, similar to a boost pedal. Some artists prefer to use a "cocked" (fixed position) wah pedal as a boost.

Other things to keep in mind are the durability of the pedal - it's meant to be stepped on, so it may not last long if poorly constructed. Also, the shape of the pedal may make it easier to step on vs. others. Additionally, the range of motion may be uncomfortable or too small on some pedals - make sure rocking all the way from heel to toe and back is comfortable in a gigging situation. Also, check the feel - how stiff is the pedal's motion? Sometimes this can be adjusted by loosening/tightening a screw.