Those "Glass Voices"... that "Guitarrrr"... there are many patches on this box that I used to think that I could not live without. If it broke down I would have to shop for a D-50 on E-Bay, I would say to myself.
Interestingly, as I re-work projects that featured this synthesizer, I find myself using alternative instrumentation in preference to the venerable D-50 tones. I don't know why, exactly. Many synths of its era have disctinctive patches that were overused in commercial productions of the day, to the point where the patches now sound cheezy. The D-50/550 certainly has its share of these, but it is still capable of many unique and fresh-sounding sounds with depth that hold up today.