Modded EMS Synthi A w/ Synthi Matrix Interface by Digitana Electronics

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via this auction

"Includes very rare Synthi Matrix Interface by Digitana Electronics which connects to the Synthi via the Presto Patch connection.
Includes power cable, all patch pins plus a couple extra cables for modulation.

There were 3 mods done (one on each oscillator) which are factory mods and allow the user to modulate the "shape" of each oscillator. Apparently a tech who specializes in Synthis mentioned this Synthi is a "MKIII" with a reverb driver based on 741 + germanium transistors (great sounding), a 5-pole filter and a MC1496 ringmod.

The EMS Synthi A is one of the most classic legendary mono synths, and it really is worth every penny, it has such unique huge analog sound and can get a range of tones like no other synth. A must have for any serious collector or musician's studio. If you have been waiting for just the right Synthi, this is the one! Don't pass this legendary synth up!"