The OBXMK gives you new control and expanded patch capability for your Oberheim OB-X. The OBX originally shipped with 32 patch locations. Now with the OBXMK, you can store 120 patches, just like later Oberheim products. The patches can be saved with the new SYSEX capabilities. You can transfer patches to another OBX (with an Encore kit) or a computer. This is very useful for the older synthesizers that are starting to lose patches because of the battery's age.
Maybe you never had the factory patches, or your cassette copy is bad or missing. Now you don't have to worry, because the OBXMK has them built in! With a simple button combination, you can load the first 32 RAM patches with the factory originals. The OBXMK allows you to control note on/off, pitchbend, filter cutoff, filter resonance, portamento and more. It can also transmit keypress information to MIDI so you can use the OBX keyboard as a simple MIDI controller. The OBXMK also sends and receives MIDI Tune Request. All parameter adjustment is done from the front panel, using the GROUP and PROGRAM buttons and LEDs.