that can be fitted with any of the proteus 2000 library of roms.the xl-7 is also a dynamic midi controller that offers you the ability to work with external midi devices via its sequencer, arpeggiators, controller knobs, trigger button section and key pad. the xl-7 sets the standard for what a professional dance groove instrument should be. §13 velocity-sensitive pads with aftertouch §512 on board sounds (expandable to 128 mb with e-mu's massive library of proteus® soundroms) §128 voice polyphony §40 assignable knobs and buttons §over 100 bpm-based synth parameters per preset §effortlessly control all of your external midi gear §real-time/grid/step interactive performance sequencer §16 syncable arpeggiators §e-loader, host software to easily download sequences and to take advantage of usb