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"The listing is for a Digital Keyboards Synergy II+ synthesizer with Kaypro II PC in great condition! One of the first premium digital synthesizers manufactured in the US , The synth is based on Dr. Hal Alles from Bell Labs synthesizer architecture.This model is the programmable version and has the solid wood casing which only came out with the very early serial numbers. The wood was replaced by tolex to reduce cost in following years. Approx 700 total Synergy units were made of which about 300 were said to be the upgraded programmable version.It is estimated that only 100 or so units are still operational today of which about 20% are the higher end wooden case version. When the Synergy II + hit the market in the early 80s, they were going for upwards of $10K for the wooden programmable version with Kaypro PC. The DX7 came out with their FM synthesis in 83 for $2500 and changed the entire synth industry. After that DK was dumping their units for under $7K with Kaypro and eventually went under in 1985. I payed $5,450 (including shipping) for this unit 8 months ago so for a 30 year old rare synth , it is still holding it's value.
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The Synergy II+ 's Kaypro II PC is in great shape as well with two functional drives and the 1980s style green light screen resolution is still very prominent. You can find Kaypro PCs for sale on eBay should you ever need a back up. The sale includes everything you see in the photos- Synergy synth, Kaypro PC and keyboard, null modem cable to RS232 port ,original operational manual for the synth( not a copy), instructions for understanding the Kaypro and the complete Synergy library.The library includes close to 500 patches. It includes the L1-L13 FDs, VCART1-VCART6 FDs and Wendy Carlos Library( WENDY 1-WENDY3 FDs). All library, diagnostic, software systems and boot disks have been backed up with multiple copies, anywhere between 4-6 sets of each. The sale also includes a 2 hour video made by the original owner who purchased this synth as a floor model in 1983. The video on DVD is well thought out as well as his written start up instructions to get a new owner going. You definitely want to review the video and documents to understand the nuances using the synth and PC software . Included are the original documents listing the names and categories of the library disks and patches/voices in alphabetical order and by instrument or sound type. Other documents include synth schematics, pin schematics if you want to make your own null modem cables and addendum released by DK.
This synthesizer is definitely not for the touring musician or quick knob turning gratification player. This synth is typically purchased as a collectors piece or a programmers synth who enjoys sound sculpting for personal pleasure or studio recording. This synth has unique architecture and very sophisticated envelope control . What makes the Synergy II+ unique even to this day is that you voice each oscillator twice for both frequency and amplitude and you have 16 different envelope points for each envelope. So you get to control how each voice changes in response to velocity. For example, you might choose to have a phase modulated envelope that rises very sharply at low velocities and dies off fast, but at high velocity(loud notes) it rises less sharply and dies off much more slowly. Or you could do the opposite with the carrier envelope scheme which means the loudness envelope of the timbre operates normally with a sharper attack the harder you press the key but a shorter decay at louder amplitudes. Since you can define two 16 point frequency envelopes for each oscillator and you are dealing with phase modulation, you can have sound going from strictly harmonic overtones to inharmonic partials and back again over time or set it up to go inharmonic to harmonic and back again. And this effect is with just two oscillators. Typical Synergy II+ patches use 3-6 oscillators so you can also detune them to get chorus effects. Another reason to set up multiple chains of oscillators for a patch is to have different sets of overtones moving in and out of harmony against one another which gives you very complex timbral effects like you would get with real instruments. Another reason to use multiple oscillators is so you can combine additive synthesis with phase modulation to create some very realistic percussive sounds like bells or chimes using subharmonics of the fundamental of a note to create that low hum that is not harmonically related to the timbre ,but present in real percussive instruments.There is a reason that Wendy Carlos still has two Synergy GDS units among her gear of only 5 remaining keyboards.
For those not familiar with the Synergy, there is a good website if you Google DIgital Keyboards Synergy Preservation Page.Also there are several YouTube videos on this unit. However, here are the basics:
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