I'd love an extension that can retrieve the frequency of the sound that's coming through the mic input - and it'd be great if it could convert it to the nearest note as well. Flash export would be a huge bonus as well.
I know Looki did an extension for this, but it couldn't be used on any commercial projects because of some library (?) he used. There's also the Pitch Object or something like that, but it's no longer supported.
I'd be ready to pay for this extension if it would work for a "real guitar hero" type of a game: play the notes on a real guitar (that goes to mic input). The only problem I can see is that it might be difficult to recognize when a note is hit and when it's just playing (for example a fast riff with 3 same notes in a row).
So, if anyone has any info on how this could work or would be interested in developing it, please post here