I am also not familiar with the controller you have, but MIDI control of the H90 is fairly straightforward. There are no default MIDI mappings, all mappings are customizable by the user.
You can make global MIDI mappings so every Program will respond to the same MIDI command such as active/bypass or tap tempo. More information can be found here: https://cdn.eventideaudio.com/manuals/h90/1.3.0/content/appendix/global.html
You can also map controls per Program by following the instructions here: https://cdn.eventideaudio.com/manuals/h90/1.3.0/content/edit-modes/parameters.html#mapping