Ok, it's working now. I like the idea and the sound is pretty good. Most free synthetic keyboards you can get (as in Vst plugins) sound worse. Good job!

Unfortunately, I seem to have terrible latency problems in Chrome and Firefox. I also do not really understand how the keys are mapped to the notes as there seem to be strange gaps. I would have expected a setup as you can find it in most trackers.

Well, great experiment. I would not yet use it for live performance, though.