The Korg SV1 digital keyboard includes two model options with either a 73 key or an 88 key keyboard both of which are combined with support for a maximum of 80 various polyphonic notes. The SV1 includes advanced features such as 512MB integrated PCM (on-board) ROM for additional storage, EDS (Enhanced Definition Synthesis) and RX (Real eXperience) sound engines, 36 varying sound and instrument options, and several advanced tuning options for greater user customization. The Korg SV1 digital keyboard/stage piano includes a large selection of connections such as the left/right Mono outputs and inputs, MIDI in/out, Damper pedal support, and 1/4" stereo headphone support.