Here thoughs on the FAC numbers. 1. Each piano is different each time you tune it. I believe you should take new FAC numbers every time you tune the same piano. Case in point, if you tuned your piano in one part of the room and then moved it to the other side, the FAC numbers would probably be slightly different. 2. The wound string are also a factor if you are going to use two pages to tune one piano. Listen to the thirds as you go up. They will be slightly off as you approach middle C if you only use one page and F3 is a wound string. 3. Finally, take the time to learn how to set good FAC numbers. It can take an aural tuner up to 40 minutes to set a good temperament so don't be afraid to take time in getting good FAC numbers. Average the 3 strings of the A and the C if you have to. It may seem cumbersome but worth it in the end when you are not breaking the high treble strings from tuning to high. Those are my sincere thought from someone who is learning every day how to use the ear and the accu-tuner. You do need both. DavidR2464@aol.com
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