I'd go with 440? For the uninitiated like myself (rock music slackers) it's generally known as the "middle". Agreed on the gain. Pretty neat idea, though. I've

I'd go with 440? For the uninitiated like myself (rock music slackers) it's generally known as the "middle". Agreed on the gain. Pretty neat idea, though. I've enjoyed playing around with the web audio API a bit. This might make some ideas happen a bit quicker, too. (I have an oscilloscope component from a toy I put together that you might be able to strip apart if you wanted to offer something like that as well. It works off of the Audio Context: https://github.com/robertfairley/web-audio-exp/blob/master/src/Oscilloscope.js https://github.com/robertfairley/web-audio-exp/blob/master/s...) edit: Just noticed that you have a scope already! Scratch that comment!