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Wow, that's some impressive signal processing you've got going there.

How accurate is it ?

Possible other output channel (if you got this far) would be automated mp3 to midi transcription.

We are quite good. Try it :)

I would if I could play the guitar!

You must have had some spectacular headaches to deal with, especially with multiple instruments playing through one-another.

This is correct. there is quite complicated math behind that.

I've been messing around with GPU coding lately, the speedups I'm seeing are pretty scary for some applications, likely you are using a lot of ffts, have you considered looking at GPUs to see if that might be a way to speed up the turn around time ?

We hadn't, since this is not an issue so far. CPU is quite cheap, so it is much easier to use cloud than adjust code for GPU.

Sending this to my guitar-playing friends!

Tangent: Given your expertise, do you think it would be theoretically possible to write a program that attempts to detects the '1' beat in Latin/Afro-Cuban music, using your techniques, live, in real-time? Maybe using clave detection. Thanks in advance.

Not at this time. We rely on the whole song analisys for much of precision improvements.

There is some literature out there on real-time beat following but the precision is poor so far

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