I can't use USB port because I use MIDI IN with MIDI foot controller FCB 1010 and I don't use Bluetooth because it's very too slow with 2 H9 connected.

Do you have a solution for me ?

Thank you for your help

If you wanna use H9 Control via the MIDI ports you will need to connect both the MIDI IN & OUT to the adapter cable. H9 Control won't work if only MIDI Out is connected.

Bluetooth should be the right way if you want to use H9 Control and MIDI controller simultanuously. It shouldn't be slow if 2 H9s are connected via Bluetooth. What device do you use for H9 Control?