I didn’t find any information about it in manual and couldn’t do something like that in system menu (maybe I didn’t search well?), but I would really cool to have the function of automatic dump the position of all midi controllers to MIDI output (usb/din), when preset is loaded. So that i can fully work with controllers with limitless encoders or motorized faders. So far, the main and best function of such controllers simply does not make reason.
Sorry this feature is not available but I can log your request. The H90 will only transmit MIDI Clock, MIDI PC messages when a new Program is loaded, or you can convert external controllers (aux switch and expression pedals) to output MIDI CCs.
There are no other options for transmitting MIDI messages.