Hammond EXP-20 Expression PedalGain hands free control over the volume of your Hammond keyboard with the EXP 20 volume pedal. With the EXP 20, you can add expressive volume swells to your performances, with all of the quality that you'd expect from Hammond. The EXP 20 is for use with Hammond XK 1, SK 1, SK 2, and XK 3C keyboards. Features Specially calibrated by Hammond Adds expressiveness to your playing Works with Hammond XK 1, SK 1, SK 2, and XK 3C