Then, when I select one of the presets on the first (master?) pedal, it sends a MIDI command to the other pedal to load the same preset number.
Maybe it is harder than I am assuming. I realize that the multi-preset would have to define which preset goes to which H9 pedal. I have mine named “Pre” and “Post” obviously for before the amp and in the effects loop respectively.
It just seems like it could be a neat feature but I understand that it may not be useful to very many H9 owners, may not be easy to implement, and maybe there are many more important things to work on.