Oh yes, the OP-X Controller. A very fat Controller with 4 octave Keyboard, Joystick, many Knobs and Switches.
This Controller is NOT a Reproduction of the original OB-X from Oberheim. This is a Controller for sonicsprojects OP-X VST Instrument. So the Layout have the same look like the Software GUI and only nearly the OB-X.
The big problem here was that the Software and the original OB-X use Buttons (push) and these buttons have LED´s. I can´t use buttons to control Midi CC´s via the Doepfer Electronic, because when i push the buttons they sends a MIDI CC Value of 127. But When i leave the buttons, at the same time the buttons sends a MIDI CC Value 0. There is no memory for the CC Values. So i must use Switches. The next problem was, that i don´t get any feedback for the LED`s . So i must use 2pol Switches and the switches turn the LED`s on/off at the same the they send MIDI Value 127 or 0.