Hi Karen, Since my hearing is going the way of my hair, away, I have been using my SAT to help me tune octaves and unisons in the high treble. I find that the SAT II wants to tune the top half octave higher than I like I want to do them be hear. I like to have between 1 and 1.5 cents stretch in the octave and then tune the unisons pure. I find that on some pianos that I have difficulty hearing when the unison is in tune so I double check it with the SAT. That is when I started noticing that often my ear and the SAT do not agree as to what is in unison. That is when I noticed that if I tune pure unison with stopped lights I do not like the result aurally and have to retune, thereby, lowering one string. This is a small amount but I do not like the idea of lowering the pitch on a unison so I find the one that wants to be flat and tune it to the SAT and the other by ear and the final one tunes up nicely. If I cannot get a good image on one string I tune it as best I can then change to another string for final analysis. I use my ears all the way except in the top two octaves, then if I have a question about a unison I will change to another string and retune using that other string. I usually tune the left string as I go up but I will use the right string often and on rare occasions I will use the middle string. The ultimate test is the way it sounds. Newton nhunt@jagat.com
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