The MIDI stuff is already implemented and working well. I support all of the most common messages you would send (even system exclusive messages), so you shouldn't have any issues being able to do what you want. I also have support for multiple output midi channels for advanced users (you will have to enable this in the settings). It will be included in version 5.0.0. I implemented it early as I've been working with KORG to get them the features they need to work with their keyboards.
Mike
Mike