I wrote this web app in May 2012—I don’t think iOS was there yet? I’m open to a pull request though https://github.com/mrcoles/javascript-piano but since the project was mainly a test for generating different wave files as dataURIs (and the piano was an afterthought that was actually spawned from this half-baked idea http://mrcoles.com/media/test/guy/ ), idk if the dataURI approach is any easier on iOS yet (or ever will be)?

If so how did you guys get the audio to play in sync across devices?

We've been trying to figure that out.