<HTML>In a message dated 3/19/01 1:27:37 AM Central Standard Time, remoody@midstatesd.net writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">I am wondering why SAT III can't tune unisons.  Or why everybody prefers to tune unisons by ear rather than by machine even though using the machine for everything else. The unisons I tuned with TuneLab sounded OK, but I do tune unisons by ear after tuning everything else with TL, hmmm I wonder why....   ---ric </BLOCKQUOTE> I have tried tuning unisons with my SAT III, and found I could do better by ear. My theory is this. Even though we can make the lights stand still, they only do so for a few seconds, then the lights go out. What we don't see, perhaps, is that eventually they will drift to one side or another. This would indicate a string was flat, (or sharp). The machine is accurate enough to tell us it is correct, but the ear is more accurate than the machine. This only hold true for unisons. I don't think it applies to octaves, 3rds, etc. There are too many inharmonicity factors involved in those intervals for us to be able to hear slight imperfections in them. Again, just my theory. I could be wrong. Willem </HTML>