MetroGnome play online

MetroGnome is a metronome app whose aim is to do one thing well: provide the practicing musician with a straightforward interface that is easy to use during practice sessions and rehearsals. Here are some of MetroGnome's features:
- Tempo indicator with a large font that is easily readable from the music stand
- Big start/stop button
- Easily accessible volume control

As the developer of MetroGnome, I am also a professional musician, and so MetroGnome *has* to work for me. As such, my focus is to build an app with a clear, concise interface that is easy to use while practicing an instrument or rehearsing. My focus is NOT to add every conceivable feature that other metronome apps have. I am not adverse to adding those features, but they must complement, or at least not hinder, ease of use.