Following the success of their Cry Baby Mini Wah is Dunlop's DVP4 Volume (X) Mini Pedal. It's an ultra-compact volume pedal with an aux output that can be used for a tuner or for expression pedal control over effects. When using the Volume (X) Mini as an expression pedal, you can set the minimum control value with an internal pot - very cool.The Dunlop DVP4 Volume (X) Mini Pedal essentially gives you all of the functionality of Dunlop's DVP3 pedal at half the size.