Oberheim Xpander Six-Voice Synthesizer with Oddernmart Xpansion

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via this auction

"This unit has the very rare Oddernmart Xpander Xpansion which allows 6 audio inputs to be introduced to the signal as the VCO-2 Noise component. This mod cost several thousand dollars alone. In all, this a very desirable piece of functional vintage synthesizer history! Includes power cord and manual copy.

Info on the Oddernmart Xpander Xpansion" [link to a PDF on synthi.se here]

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Oberheim Xpander with Oddernmart Xpansion

via this auction

"This synth also has the Oddernmart Xpansion (see picture) which lets you plug in any audio source and process it with the Xpander's great 15-mode filters and control sources. This turns your Xpander into a 6-channel analog audio processor."

Oberheim Matrix-12 Modded

images via this auction. Spotted by Chris.
"This is a classic Oberheim synthesizer! It belonged to a professional musician and powers on. It has been modified for pressure sensitivity and separate audio out."
Anyone know what the pressure sensitivity mod might be? The audio outs I'm guess are the individual outs for each voice on one of the side panels of the Matrix-12 although there aren't any shots in the set.