MATRIXSYNTH: Oberheim OB-SX w/ Magic Box MIDI & BCR2000 Controller

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Tuesday, October 17, 2023

Oberheim OB-SX w/ Magic Box MIDI & BCR2000 Controller

via this auction

Pics of the inside below.

"This is an Oberheim OB-SX 6 voice analog synthesizer. It has been upgraded with a New "Magic Box" MIDIcontrol device from MIDI Soft in Germany. The Magic Box includes 56 additional patches to the 56 already in the OB-SX. This includes a Behringer BRC2000 that has been programmed with the MIDIcontrol software included with the Magic Box. I had new custom Oak Wood end cheeks made that were wood stained to come closer to the OB-SX wood end cheeks. The BCR2000 also has a custom Over-Lay to represent all the parameters for the Magic Box. The connections to the OB-SX are simple, just attach the box to the interface connector in the rear center of the OB-SX and plug the box in. The MIDI connections are as follows, MIDI "In" from the box to MIDI "Out A" to the BCR2000 and MIDI "Out" from the box to MIDI "Thru/Out B" on the BCR2000. The BCR2000 is set up for Stand-Alone 3 or S-3 on the unit. You can change anything you want but this is how it is set up presently to use. Once the BCR2000 is hooked up, press the "Auto" button on the OB-SX to Tune all the Voices. Turn on the BCR2000 and plug in the Magic Box (there is no power switch on the box). I will include both USB power cable and AC power adapter with the Magic Box. I will also include the power cable for the BCR2000 and OB-SX. Once everything is on and tuned, select a Patch from the lower Left controller on the BCR2000 and press "Load", lower Right. This needs to be done each time a patch is selected on the BCR2000. You can also select banks and patches on the OB-SX by just pressing them, this will allow you to use the presets and Edit the patches in the OB-SX from the BCR2000. I will send the instructions I printed out, but you can also go to the MIDI Soft website. This is basically a trimmed down version of an OBXa with full control like the OBXa. The voice cards are almost identical, same CEM3340 VCO's, CEM3310 VCAs, but only one CEM3320 VCF 12dB 2 pole filter. The only difference is that the OBXa has 2 CEM3320 chips, one with the 12dB 2 pole Oberheim configuration and one with the 14dB 4 pole Moog style configuration. Other than that, they are basically the same voice cards and now you have the same controls as the OBXa with the programmed BCR2000 and Magic Box. Also, the OBXa has 120 presets. With the Magic Box, you now have a total of 112 presets on the OB-SX and an extra 56 User presets to make your own patches.

The unit itself has been well kept. All the keys, knobs, switches and buttons work. The unit tunes fine when the "Auto" button is pressed. All oscillators work as they should. All of the keys are very quiet and have nice action. The inside is immaculate. The outside case has some scratches and chips on the hood, the underside has longer scratches. Please review all the pictures before purchasing or making an offer. The unit is very deep, about 20", I had to customize my keyboard rack.

· This is a super rare, from the factory 56 patch (switchless), 6 voice late production version – voice cards are the 4 pin variety and are dated: “Nov 04 1981”

· Coming from the factory with 6 voice cards.

· Has had a full power supply rebuild within the last 3 years, modern capacitors & rectifiers with better specs than the OEM 1981 designs.

· Several other internal items were replaced along with the power supply, including: dip switch selector for the voice boards and *ALL* of the potentiometers on *ALL* the voice cards have been upgraded to the multi turn, “box” style as opposed to the original single turn “dial” type potentiometers. Huge difference in calibrating and holding precise values.

Most of the Oberheim classic sounds are factory presets in this fabulous instrument. It will ship with a power cord. The unit should warm up for about 15-30 minutes before use even though it tunes fine at first power up. The units will be double boxed for protection in shipping. The main unit is also very heavy."

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