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I made a web app that does spectral audio analysis, calibrated for piano

http://guciek.net/jsspect/en

It's lots of fun, and I can see some serious uses for it, for example it could generate sheet music in real time, you could fiddle with an acoustic piano and afterwards have a record of what you played


Here's an image from me playing Bach's Goldberg Variation 1:



And here's Glenn Gould playing the same variation

Real-time sheet music? That does sound useful!