
via
this auction
"INSTANT ACCESS TO ALL 500-PLUS VOICES IN THE SYNERGY SYNTHESIZER VOICE LIBRARY... This cartridge modification uses a Zero Insertion Force socket and 23 EPROMS to give you instant access to all of the timbres (voices) in the Synergy voice library, plus the 3 Wendy Carlos cartridges and a rare custom cartridge containing unique voices created by a Synergy synthesizer user with a Synergy II+.
The Synergy voice library cartridges are: L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12, L13 and VCART1, CART2, VCART3, VCART4, VCART5, VCART 6. The 3 Wendy Carlos cartridges are W1, W2 and W3. And the unique custom cartridge is C1. That's a grand total of 552 timbres -- 24 of them unique to this custom cartridge and created by a Synergy II+ user and not available anywhere else. (I used to think there were only 2 Carlos cartridges, but it turns out there are 3, and I was able to track down the third one, as well as a rare custom cartridge. That's why the total mentioned in the YouTube video is 504 voices.)"
Video of the mods
posted here.
And another:
DKSynergy.wmv
YouTube Uploaded by drumsoverlondon on Jun 1, 2010
"DK Synergy synth"
"If you own a Synergy synthesizer (either a I or II+) this cartridge modification will bring new life and new depth and new brilliance to your instrument. You'll discover new worlds of timbre, from subtle realistic acoustic-sounding timbres to exotic digital computerlike soundscapes. The Synergy was capable of creating diaphanous sounds as delicate as a butterfly's wing, or raucous digital timbres as intense as a Mack truck. This cartridge mod contains the full sweep of the timbres created for this unique digital synthesizer (one of the first and most powerful digital synthesizers ever designed) to reveal the synth's full capabilities. If all you've ever heard is the internal Synergy timbres or one or two Synergy voice cartridge, this voice cartridge modification with its 23 EPROMS will shock you and amaze you."