Hi Leezone,
After You have made the Midi-settings, and before leaving the Midi-screen, press "SAVE". Display says : "Save Midi Setting"
This will save the Midi-settings in the appropiat Midi-Preset.
After this, return to the Main-screen, and press
"Save" ---> "Custom Startup".
This will force Your Audya to startup with the choosen Midi-preset.
Best Regards,
Carlo.