Update 2014-09-26:
Plugin updated to 1.1 - looping was throwing an exception, and "Stop" didn't!
Update 2014-05-16:
Piano Sample r168 (no ChromeConsole plugin needed)
Update 2013-05-21:
I'm releasing the MIDI plugin. There's still lots to do & cleanup, but here's the first version.
BHT_MIDI - 1.1
Piano Sample
Manual
I'd like this to be more complete, but it's just dragging out. I will be filling in the manual throughout the week, and there may need to be a tutorial as well.
Original post:
I've got a long way to go, but I've started on a MIDI plugin.
MIDI Sampler
This is a whole lot of hack-work. This thread caught my eye: Web Audio API and MIDI, so it's based on this.
So far, this is a hack of the MIDI.js code, the C2 Audio plugin, and Pode's DragnDropZone plugin.
You need to press the Preload button first to get the sounds local to your computer, but from there you can try the three sample songs, press the piano keys, or drag a .MID file onto the gray drag-n-drop zone.
There's some handy test files here: use the download link
(Hmm, link works in IE but not Chrome: http://www.personalcopy.com/midi.htm)