Oberheim OB-Xk

Oberheim OB-Xk Image

The Oberheim OB-Xk is a MIDI keyboard controller from the mid-eighties. Originally designed to control the Matrix and Xpander modules, it uses MIDI and works fine as a controller for any MIDI gear. It's got 61 keys that respond to velocity and aftertouch, two OB-style Pitch/Mod controllers, and one assignable continuous control slider. From the front panel you can directly access the first 100 single patches and/or 100 multi patches of your MIDI module. Any additional patches must be selected by another MIDI controller.

Other features include the ability to transpose up or down by up to 2 octaves or by half steps. The keyboard can be split into 3 zones. There are basic Hold and Chord memory functions and an Arpeggiator section with pretty decent features (it can use internal or external clock). The OB-Xk can also send a sequencer Song Select, Start and Stop commands. It's built with Oberheim's classic & vintage look: solid black metal case with wood end-cheeks. Definitely a unique controller to have around, although severely limited by today's standards.

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18 Visitor comments
June 17, 2012 @ 12:34 pm
seg--I upgraded that rig with a faster processor and Audigy Platinum sound card, and Vegas plug ins, a ton of them like the B4 and other soft synths until the old Athlon burned out. I put the XK on Craig's List for fifty bucks and within seconds, people were offering much more and unlimited shipping. I then found road-rashed Ebay units for six to nine hundred bucks, and 150 bucks to ship. Since 1986 when I bought an Atari 140ST, and then the XK to control my little backroom studio, every scrap of it soon became obsolete except the XK, which says a lot about the basic usefullness of the unit.
February 2, 2012 @ 2:21 pm
I am looking for a EPROM version of the software more recent than an rev 1.
December 13, 2011 @ 3:04 pm
HI Everybody, I'd be also interested on having not only the user manual but also the shematics because mine (wich I haven't received yet) seems to have a power supply problem.... I'd very pleased that somebody put that kind of info somewhere online because (apparently I'm not the only one) I may really need it...
All my very best from france !
December 10, 2011 @ 5:29 pm
Would anyone know where or how to find a users manual for this OB Xk/ I had read someones request for it, however I didn't see the reply, if possibly, anyone who knows how I can download one, I would be grateful. I can buy one for $20.00, however, I would think there must be a way to get it without purchasing, or at least i hope there is a way.
December 6, 2011 @ 9:07 am
Not Craig Anderton. Craig Anderton is a good writer, but I don't believe he did any design work. Wrote a lot of user manuals.
My last name begins with 'L' and I'm not well known.
If you have a XK and an Expander, hold down 5 & 6 on the XK, and power up. You will see my full name on the Expander display, or if you have a midi monitor program, capture the Oberheim system ex. msg that is spit out.
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User Rating

Rated 3.38 (94 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - n/a
  • Oscillators - n/a
  • Effects - n/a
  • Filter - n/a
  • Arpeg/Seq - Arpeggiator with internal/external clock sources
  • Keyboard - 61 keys (velocity, after-touch)
  • Memory - 100 single patches, 100 multi patches, 3 zones
  • Control - MIDI Out (1 channel at a time)
  • Date Produced - 1986
  • Resources & Credits
  • Images from Synth Site

    Thanks to Scott Marcotte for providing information.

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