memory card inserted into the built-in slot. Yamaha YS100 The Yamaha YS100 was the previous YS synthesizer released by Yamaha, the only differences with the YS200 are that the YS100 lacks the built-in sequencer and aftertouch. References Further reading External links YAMAHA Keyboards - New products archives over 20 years. Detailed Yamaha YS200 images and internal photos. Yamaha synthesizers Music workstations Polyphonic synthesizers Digital synthesizers