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7. Store The Store button is used to save your custom edits to the user presets. See page 17 for more information about storing presets. 8. Expression Pedal The Expression Pedal provides real-time control of the RP255’s Volume,Wah,or the assigned effect parameter. Almost every parameter is available for Expression Pedal control. The Expression Pedal is equipped with a V-switch that activates or deactivates the Wah feature when you apply extra pressure to the toe. See page 20 for more information