Over-pull tuning helps when doing a pitch-raise on a piano. It works by setting tuning targets higher than the real targets so that the pitch of each string will settle down close to the correct pitch by the end of the tuning after all the strings are done interacting with one another.

Over-pull tuning is divided into two parts called pre-measuring and tuning. The pre-measuring is the process of measuring the pitch of the piano before you start to tune it, and it should take about half a minute. Then the tuning is done with the over-pull offsets added in automatically.

Before starting an over-pull tuning it is important to have a tuning loaded, because you will not be able to load a tuning or make a new tuning once you start over-pull. Often it is best just to use the AVG tuning for pitch-raises, because the process of making a custom tuning is not valid when the strings are too far from the correct pitch.

After starting the pre-measuring from the Settings page, the software will immediately switch back to the tuning page and VoiceOver will say "Play C1". At this point you should play C1 and hold it for one second. Then the software will say "E1", and you should play E1, and so on, proceeding through all the C, E, and G notes. Try to leave a very short period of silence between notes by letting up the key before playing the next note so that each note sounds distinct and separate from the one before it. This continues for all 22 notes, ending at C8. After C8 has been pre-measured, VoiceOver will announce the results of the whole pre-measurement process and the software automatically will switch to over-pull tuning, starting with A0. From this point you should tune straight up the scale in half-steps, tuning unisons as you go. The over-pull calculations have been designed to work with that specific tuning sequence.

If you play the wrong note during pre-measuring, or make some other mistake that might produce an incorrect measurement, you will have to start the over-pull process over from the beginning.

If you stop playing notes before the pre-measurement process is complete, the software will recognize the pause in two seconds and announce the end of the pre-measurement process with VoiceOver. It is not necessary to pre-measure all 22 notes because the software will use the highest note measured to represent all the rest of the notes. But if the process does stop before you intended it to, it is best to start over again and try to make each note clear and distinct.

Tuning in over-pull mode is just like normal tuning, except that an additional offset is shown on the screen and added onto the pitch. That offset is roughly 25% of the amount by which the piano was flat to begin with, but the over-pull amount varies depending on where you are in the scale. This amount is displayed on the screen, just under the TCurve offset. If that amount is higher than the safety limits you have in place, the over-pull amount will be limited to that safe amount. Here is a more complete description of safety limits.

During over-pull tuning, the Measuring Inharmonicity button is redefined as the Stop Over-pull button. This button will turn off over-pull mode and return to normal tuning without any over-pull offsets applied.