WebMIDI Controller Prototype
I built a prototype interface for controlling a rectangle on a screen with a MIDI controller in the browser. This was a quick little idea but it has some interesting editing UX ideas inside of it. You can create new controllers to control different facets of the rectangle, and set a min and max range for each value, and attach various MIDI knobs to each facet. It also has a decent design for the MIDI inputs themselves.
I am still interested in non-traditional uses for MIDI on the web, but I tabled this idea for the time being.