[Zubersoft]

Is the Android OS treating the Yamaha M0xf as an audio device when connected over USB? I want to check this because that has caused major issues for me with the MIDI functionality with some devices and I don't know at this moment how to prevent the OS from trying to treat the keyboard as an audio output device (I see this with my Yamaha SX600, for example). If you can connect through something like a Roland UM-One, mioXC, WIDI Master, WIDI Jack, etc, then this would get around the issue. You can also try switching the MIDI library in MobileSheets to the "Default/Legacy" instead of using the Google MIDI library to see if that helps. Also, if you can, try testing with multiple cables to ensure there is no issue there (I've certainly seen that in the past as well).

Mike