Oberheim Matrix-12 SN P52511

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via this auction

Pics of the inside below.

"All six original encoders work properly, click properly with no skipping. All push buttons work properly without double clicking or sticking.

All LED screens and letters work properly with no lights or digits burned out and no faded characters. All 12 voices (VCOs + PW + VCA + VCF) tune properly with one simple touch.

All keys function properly. Even the inside of this unit as seen in the photos is spotless- no dust bunnies here!

The inside of this Matrix-12 looks literally brand new as seen in the photos.

All the silkscreen on the back of the unit with the "MATRIX 12" label and on the front show no signs of fading or scratches or discoloration.

Original wooden panels look practically new with little to no wear.

This Matrix-12 is MADE IN USA."