The Bluetooth connection is sending the same sort of control signals (in functional terms) as the MIDI. So, if you have both active, they may fight each other to some extent. To make them work at all together, we have had to make MIDI lock out Bluetooth and vice-versa so they don't interrupt each other in mid-message.
It is likely that this lockout process can be improved. The way the unit was conceived, it was that people would use BT for editing, and MIDI for performing. As we are leaning, the reality is much more complex.
