- var isIos = navigator.userAgent.match(/(iPhone|iPod)/i); + var isIos = navigator.userAgent.match(/(iPhone|iPad)/i);

Thanks for letting me know it was still broken!

Unfortunately, as I said above, it will not play the music, but it will still shoot out waveforms from the piano. I spent several hours experimenting with different dataURI settings and then trying falling back to static .wav files. The latter was the most promising, but there was still a huge lag between calling .play() and the sound actually playing. Looks like you still have to rely on actual "apps" to have good sound on iOS. (If someone knows otherwise, please share!)