John, I don\'t have the answer to your question, but I\'ll tell you my experience. The tuners that I have seen (software and otherwise) are way imperfect with many or most real world sounds. And what if a piano has heavy overtones on attack, but different tones while it rings out? You really just have to earball each one for best results. I do my calibrations by ear, against a DSP based nord modular playing a pure tone.
It takes a long time, but if the programmer doesn\'t spend the time to listen to how every sample sits, who will?