Rob; Thanks -- I finally found the tracking sub-directory in the 1.2.1.3 docs.
(FWIW, I'd been looking in the 1.2.1.2 docs as well as the online examples in http://chuck.cs.princeton.edu/doc/examples/, which is why I didn't previously find them. I'm looking forward to the fruits of the online documentation efforts!)
Yes, that was a issue. For some reason the tracking example was removed from the 1.2.1.2 version while it was in 1.2.1.1. I think that must have been done by mistake as that particular example turned out to be very useful for a lot of people. Good thing it's back now. I can understand how that would lead to confusion.
And yep, I'm keenly aware that pitch tracking is non-trivial. I'll let you know if I get hung up on UAna-specific issues, though.
You may want to also look into Ge and Rebecca's work with "smelt" and the paper on the analysis stuff. Typically I find that you'll end up with a cross between science and gut feeling about the particular kind of signal you are interested in tracking. Whistling and flutes are relatively easy while -for example- tracking pitch on voices is hard. Guitar notes (not chords) are easy, aside from the attack (which you can more or less forget about). Good luck! Kas.