Zoom FS01 Expression Pedal Perfect accessory for a large array of Zoom products Bring out the full potential of your Zoom equipment Compatible with the 503, 504, 505, 506 ,507, 508, 509, 510, RT323, RT123, RT234, RFX2000, 2020, 3030, 4040, 1202, MRS1044, 4040, 9120 and many otherZoomproducts.