Keyboard Synthesizer CS 15 D Yamaha

https://soundcloud.com/theo-moebus/yamaha-cs15d-monophonic-4
http://www.vintagesynth.com/yamaha/cs15d.php
http://www.synthtopia.com/content/2010/11/20/yamaha-cs-15d-vintage-synthesizer-demo
http://www.sonicstate.com/synth/yamaha_cs15d