Scott,
I am not sure how you can verify a certain pitch, unless you had a segment where a single musician held a distinct note for a period to time, which you then might be able to discern using the spectrum analyzer, but I don't find the view provided by SF to be that accurate. In the olden days, with Nak cassette decks that had pitch control, i.e. the ability to increase or decrease the tape speed by small increments, it was all done by ear. There were times when you could tell that the cassette source was losing battery power, further into a set, so sometimes this involved adjusting the pitch control at the beginning of a song part way through the set. Let us know if you find any other way of figuring this out with greater accuracy.