The 5.5 series introduced several critical refinements to the established Logic environment: EXS24 MK II

| Problem | Solution | |--------|----------| | No MIDI input | Reinstall driver, try different USB port, ensure Oxygen is set to (factory default). | | Stuck notes | In Logic: Options > MIDI > Reset MIDI Drivers (Ctrl+Shift+Option+Delete on Mac). | | Oxygen not seen in Logic | On Windows, use MIDI-OX to verify MIDI data arrives. If MIDI-OX sees it, Logic will too after restart. | | Knobs jump in value | Change Oxygen knob mode from “Absolute” to “Relative” (via Enigma or Oxygen’s built-in editor). | | Logic 5.5.1 crashes on USB MIDI | Known issue. Workaround: Use a MIDI-to-USB cable instead of Oxygen’s native USB driver (i.e., connect Oxygen’s 5-pin MIDI Out to a generic USB MIDI interface). |