Hi Michael,

Love the browser app. It's simple and clean. My only suggestion, and it's minor, would be to clean up the click at the end of the 1st metronome hit... by putting a fade at at the end of the original sample you are using, or cut it at a zero crossing.
Like I said, a very minor suggestion, but any musician who happens to be an audio engineer would likely lose their mind trying to ignore that click.

...might as well add an option for choosing some different metronome tones while you're there?

Anyway, great work. Thanks for putting out there!