Module Synthesizer D 550 EX Roland EX + Multi

http://it.wikipedia.org/wiki/Roland_D-50
http://en.wikipedia.org/wiki/Roland_D-50
http://www.vintagesynth.com/roland/d50.php
http://bobbyblues.recup.ch/roland_d-50/d-50_examples.html
http://www.gearslutz.com/board/electronic-music-instruments-electronic-music-production/621194-whats-your-favorite-hardware-digital-synthesizer-4.html