MC-808: Setting the USB Mode
If your computer does not recognize the MC-808 when loading the driver or using the editor, it may be that the USB mode is set to "Storage" instead of "MIDI." Use the following procedure to change the USB mode to "MIDI."
1. Press the SYSTEM button on the MC-808.
2. While holding down the SHIFT button press dynamic pad #8.
3. Use the Value Dial to set the USB Mode to "MIDI."
Note: At factory default the unit is set to "Storage" mode.