Nit picking but it would probably be better to have the white keys be a-s-d-f-etc. just because they're the home keys and where my fingers felt more natural. Awesome idea though and I love that browsers are capable of this.
Edit: If there's a reason for not having this be this way, I apologize; I'm a drummer and not privy to computer based synth.
Your idea is interesting feedback. There is a legacy associated with this pattern, though: Going back to at least 1989 (Amiga Protracker family), people have been using this layout because it allows two simultaneous octaves, one at qwertyuipo and one at zxcvbnm,./
That's what I'd figured because it was just so interestingly laid out but I was just thinking about finding the home keys and knowing where to begin. Once again, entirely speaking as someone coming from zero keys playing experience.
Edit: If there's a reason for not having this be this way, I apologize; I'm a drummer and not privy to computer based synth.