Not sure if this has been discussed or is common knowledge but I thought I’d mention it. Finally resolved a very frustrating issue when my PBC6X would not communicate via MIDI DIN with one my H9’s. Turns out that not only are there Bluetooth and USB co-connective issues, but the H9 simply would not accept MIDI traffic from the PBC/6X via DIN when the USB B communications cable from my MacBook Pro was connected to the H9. In fact, the USB cable has to be completely detached from the H9 not simply unplugged from my laptop. Weird, but man that was almost three straight days trying to sort that out. Maybe this will help someone avoid the same frustration.