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Griffin Support

What's the 1/4" jack on the back for?

StompBox includes an input on the back for an optional expression pedal. You can use an expression pedal with StompBox to control variable effects such as volume levels, auto-wah, gain levels, and many more. You can set the effect of your expression pedal from the StompBox Settings window.

Expression pedals are available at most locations where guitar effects pedals are sold.