MATRIXSYNTH: Oberheim Xpander SN 700113

Wednesday, March 24, 2021

Oberheim Xpander SN 700113

via this auction

"A truly insane powerhouse of a synth, there aren't many quite like it, effectively modular in its routing capabilities, more versatile than a good chunk of VSTs, but with a completely analog signal chain, simultaneously you can use:
- All 6 voices together or individually (fully multitimbral)
- 30 LFOs & 30 Envelope generators (5 per voice)
- 12 Oscillators
- 6 Filters with 16 different modes each
- 18 Tracking generators
- 24 Ramp generators
- 90 (yes, 90) VCAs (all modulation sources to almost all voice parameters)

Additional noteworthy features
- Stereo out with panning & multitimbral capabilities
- CV/Gate input for each voice
- Ability to assign all 16 MIDI channels
- 100 presets
- Positive and negative attenuation for all modulation sources

This is the Japanese made model, however it has a switch for 110V/220V so it will not require a transformer regardless of where you are. The encoders feel fantastic still, and the synth is fully functional after recently being serviced.

Cosmetically, there is some rust along the top and bottom metal panels (photographed in the 4th picture), the main panel is very clean however. There are also some scratches to the side wooden panels but nothing major.

Recent servicing:
- PSU transistors replaced with new old stock
- PSU Recapped
- DAC replaced with new old stock
- Some logic chips replaced
- Dead CEM3372 chip replaced with original with similar date code

Firmware versions:
- Main processor firmware version 1.2
- Voice firmware version 1.2

'An analogy to the Matrix Modulation system might be all of those millions of wires that existed on the first modular synthesizers. As cumbersome as all of that wiring was, it allowed the user to connect any input to any output, resulting in sophistication and flexibility unmatched by any programmable synthesizer...until now.'"

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