Used Roland D-550 Linear Synthesizer unit. This is a rackmount version of the classic D-50 synth from the 80's. This unit uses a combination of 8-bit PCM samples and Linear Arithmatic Synthesis, with subtractive-style synthesis and low-pass-resonant filters. The unit also has built-in chorus and reverb. Great for creating beautiful and ethereal pad sounds. Tested and in great working condition. Includes 2 Voice Crystal X 64 voice RAM cards, a PN-D50-00 patch data memory card, and an M-512E memory card.