[adam-a]

Hi, nice tool. I just gave it a go and it seems reasonably accurate. I've recently been developing something similar - I'm detecting singing pitch for use in a game. I wonder did you use any particular method for detecting the pitch?

[robhack]

It's FFT-based. Then I do some basic computation to try and guess the « best » peak, taking the harmonics into account. Still need lots of work and I suck at math.

[xyzzy_plugh]

Not sure about OP, but I've always loved the simplicity of counting the zero cross-overs in one direction (E.g. positive to negative) with some gutter. With raw PCM this is trivial to implement in any language -- I last did this in bash. Then you just do a look up from frequency to note and you're done. It's also not very CPU intensive, and you can even sample less frequently and get pretty great results.