David, (Ilvedson) For purely scientific reasons, tuning the top note of a treble octave to an open unison of the lower note is more prone to accumulating error than is tuning single string to single string. I did not say there were no people who could do it and come out just fine. There are. I have seen and heard them do it. They do purely aural tunings, and they tune unisons as they go throughout the entire piano. However, I will stand by what I said, and I shared that little item with everyone because it does work. Sincerely, Jim Ellis
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