Roland D-50

The Roland D-50 is a polyphonic 61-key synthesizer produced by Roland. It was released in 1987. Its features include Linear Arithmetic synthesis, on-board effects, a joystick for data manipulation, and an analog synthesis-styled layout design. The external Roland PG-1000 Programmer could also be attached to the D-50 for more complex manipulation of sounds. It was also produced in a rack-mount variant design, the D-550, with almost 450 user-adjustable parameters.

The D-50's capabilities could be modified through the addition 3rd-party products by Musitronics, most notably the M-EX which made the D-50 multitimbral (the D-50 was bi-timbral), as well as a chip that improved the D-50's response to incoming MIDI commands and a system for burning custom PCM cards with user samples for playback in the D-50.