Tuning the Skeleton (F3-A3-C#4-F4-A4) is very precise and accurate if done right.
The Lower Skeleton (F3-A3-C#4-F4) tunes an accurate C#4.
The Upper Skeleton (A3-C#4-F4-A4) tests your initial F3 accuracy by testing the accuracy of F4, which allows you to correct F4, and then F3, if needed.
The goal is to have each M3 increase by the same percentage, but you still get 100% if you are off by as much as 5%.
The Lower Skeleton (F3-A3-C#4-F4) tunes an accurate C#4.
The Upper Skeleton (A3-C#4-F4-A4) tests your initial F3 accuracy by testing the accuracy of F4, which allows you to correct F4, and then F3, if needed.
The goal is to have each M3 increase by the same percentage, but you still get 100% if you are off by as much as 5%.
User: 002
Piano: Unknown
Date: August 14, 2020
Piano: Unknown
Date: August 14, 2020
Lower Skeleton (F3A3-A3C#4-C#4F4) - Unfiltered
Lower Skeleton (F3A3-A3C#4-C#4F4) - Filtered
Upper Skeleton (A3C#4-C#4F4-F4A4) - Unfiltered
Upper Skeleton (A3C#4-C#4F4-F4A4) - Filtered
Comments
The Lower Skeleton was very well done!
The Upper Skeleton can be hard to hear especially when you are just developing your filtering.
Confirm with the filtered recording that the F4A4 is indeed very close to C#4F4. In fact, when I listened to it, my ear was telling me it was slower, but the measurements say F4A4 was faster. Perhaps it was an auditory illusion based on the big difference between A3C#4 and C#4F4.
Then try to confirm that you can hear the same relationship in the unfiltered recording.