I looked at the JS over here http://codebase.es/riffwave/riffwave.js http://codebase.es/riffwave/riffwave.js and find this line this.dataURI = 'data:audio

I looked at the JS over here http://codebase.es/riffwave/riffwave.js http://codebase.es/riffwave/riffwave.js and find this line this.dataURI = 'data:audio/wav;base64,'+FastBase64.Encode(this.wav); (edit... more accurately the whole RIFFWAVE function blows my mind) Really quite revolutionary (in terms of my understanding)... I already knew about making JPEGS etc, so this makes perfect sense but just seeing him build all the headers for a wav file in memory then "spit it out" to the page is stunning. Kudos, Bravo, Standing slow clap, etc... Thanks for sharing.