I've thought about doing something like that too,
And I think without external hardware and using the comparator, the DFT idea Josuetas was working with a while back might have the best chance at detecting the notes.
It may even be able to detect multiple notes at the same time (chords).
I played with the spreadsheet, but didn't try any hardware.
And whether the resolution will be tight enough to distinguish 9/8, 10/9 and 16/15ths steps, I don't know either.
It was originally for DTMF tones.
Might be worth a look though.
http://www.picbasic.co.uk/forum/show...2606#post42606
And the original AppNote (AN257) ...
http://www.microchip.com/stellent/id...pnote=en024294
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