The “Digital Keyboards” Synergy was released in 1982 and used the same additive synthesis engine as the 1979 GDS (General Development System) by GDS Bell Labs and Crumar. All sounds of the Synergy were and had to be programmed in the super expensive GDS. The Synergy’s additive synthesis engine offered up to 32 triangle- and sine-based partials, plus FM-synthesis.

The 12-bit oscillators were interpolated to 16-bit. Instead of a resonant filter, the Synergy had a digital 128-band fixed filter bank. The Synergys most famous user had to be Wendy Carlos, who created most of the stock library and used it for her 1982 “Tron” soundtrack. The synth can also be heard on Tangerine Dreams “The Thief” soundtrack, as well as Michael Jacksons “Thriller” LP.