88 keys, Balanced Hammer Action Keyboard (Initial Touch/Aftertouch) Tone Generator Synthesis Type AWM2, Modular Synthesis Plug-in System Polyphony 62 Notes (Expandable with Modular Synthesis Plug-in System boards) Multitimbres 16 parts (internal) 3 or more Plug-in Board parts (1 for each Single Plug-in Board; 16 for Multi Plug-in Boards), A/D Input.