Roland D-550 Digital Rack Synthesizer Module with PG-1000 Programmer

via this auction

"The D-550 is the rack version of the D-50 keyboard, one of the first all-digital synths offered by Roland (in reaction to the wildly successful Yamaha DX-7, if you’re interested). This synthesizer, although it’s digital, sounds absolutely FANTASTIC, a really beautiful, glorious sound. The PG unit allows you to adjust synthesizer parameters without menu diving. The units are in very good condition considering their 25+ year age. All is known to work and sound perfectly..."

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