Changing the overall tension of a piano causes notes already tuned during a pitch correction to move again as later strings are adjusted. A pitch raise handles that movement by sending early notes beyond their final targets so they can settle back toward the intended tuning.
That sounds like a percentage problem, and older rules of thumb often treat it that way. If a note starts a certain number of cents flat, apply some fraction of that deviation as extra sharpness. Useful shorthand, but not a complete model.
Professional tuning systems commonly divide the keyboard into regions or calculate a separate correction for individual notes. Some ask where the bass bridge ends or where wound strings give way to plain wire. Others model expected structural movement and produce note-by-note pitch compensation instead of applying one percentage everywhere.
A fixed overpull percentage can still be a useful starting rule on a reasonably even piano. It becomes less convincing when the instrument is unevenly flat, changes string type across a break, or needs a large correction. A note that began 30 cents low does not necessarily need the same relative overshoot as another note 30 cents low several octaves away.
Safety limits matter too. Professional ETDs can cap the extra pitch allowed during a rough pass, and some use different limits for wound and plain strings. More overpull is not automatically better because the aim is enough compensation for the note to land near target after the rest of the piano moves.
The release behind register-dependent piano overpull follows that broader professional approach rather than treating the keyboard as one percentage. The important idea is general. Overpull predicts settling, so a useful prediction has to account for where the note sits.
Different professional systems even prescribe different sequences. One may calculate its offsets assuming you move from the bottom note to the top while tuning unisons as you go. Another may direct you from the tenor break through the treble before returning through the bass. Those differences are not cosmetic workflow preferences.
They show that the overpull model is built around an expected pattern of structural loading. If you calculate compensation for one tuning order and then work in another, the piano may not settle as expected. The same issue appears when you tune only one string of each unison during the rough pass instead of bringing the full unison up as you go.
This also explains why pre-measuring matters. Once you start changing string tension, the original pitch map has begun to disappear. A pitch raise calculator works best when it knows where notes were before correction, then uses those starting deviations to estimate how far beyond the desired target each note should travel.
Large corrections add another wrinkle. Raising string tension can alter measured inharmonicity, so a tuning curve captured before a major pitch change may not be ideal for final fine-tuning. A rough pass can bring the piano near its intended level, after which fresh measurements describe the instrument in its new state more accurately.
Professional tuning software can compensate during pitch lowering as well as raising. Instead of overshooting sharp and expecting the note to fall, the temporary target can move beyond the desired pitch in the opposite direction. The sign changes, but the reasoning does not.
Simply placing every sharp note directly on its final target during a large lowering pass can leave earlier work displaced by the time the rest of the piano is finished. A compensated rough pass anticipates that interaction, then a fine pass handles the smaller errors that remain.
A rough pitch correction is designed to redistribute tension efficiently and leave the instrument close enough for accurate fine work. Final tuning still benefits from fresh measurements, stable pin setting, careful unisons, and another check of notes that moved after their first adjustment.
That sounds like a percentage problem, and older rules of thumb often treat it that way. If a note starts a certain number of cents flat, apply some fraction of that deviation as extra sharpness. Useful shorthand, but not a complete model.
Overpull changes across the keyboard
A piano does not respond uniformly when hundreds of strings are moved toward a new pitch level. Wound bass strings, plain-wire middle strings, and treble strings load the structure differently, while the plate and soundboard respond to the accumulated tension change. The amount an already tuned note later moves therefore varies across the instrument.Professional tuning systems commonly divide the keyboard into regions or calculate a separate correction for individual notes. Some ask where the bass bridge ends or where wound strings give way to plain wire. Others model expected structural movement and produce note-by-note pitch compensation instead of applying one percentage everywhere.
A fixed overpull percentage can still be a useful starting rule on a reasonably even piano. It becomes less convincing when the instrument is unevenly flat, changes string type across a break, or needs a large correction. A note that began 30 cents low does not necessarily need the same relative overshoot as another note 30 cents low several octaves away.
Safety limits matter too. Professional ETDs can cap the extra pitch allowed during a rough pass, and some use different limits for wound and plain strings. More overpull is not automatically better because the aim is enough compensation for the note to land near target after the rest of the piano moves.
The release behind register-dependent piano overpull follows that broader professional approach rather than treating the keyboard as one percentage. The important idea is general. Overpull predicts settling, so a useful prediction has to account for where the note sits.
Tuning order changes what the correction predicts
The tuning sequence is part of the calculation because every later tension change affects what came before it. This is easy to miss when overpull is described as nothing more than adding a percentage to a flat reading. The percentage and the procedure are tied together.Different professional systems even prescribe different sequences. One may calculate its offsets assuming you move from the bottom note to the top while tuning unisons as you go. Another may direct you from the tenor break through the treble before returning through the bass. Those differences are not cosmetic workflow preferences.
They show that the overpull model is built around an expected pattern of structural loading. If you calculate compensation for one tuning order and then work in another, the piano may not settle as expected. The same issue appears when you tune only one string of each unison during the rough pass instead of bringing the full unison up as you go.
This also explains why pre-measuring matters. Once you start changing string tension, the original pitch map has begun to disappear. A pitch raise calculator works best when it knows where notes were before correction, then uses those starting deviations to estimate how far beyond the desired target each note should travel.
Large corrections add another wrinkle. Raising string tension can alter measured inharmonicity, so a tuning curve captured before a major pitch change may not be ideal for final fine-tuning. A rough pass can bring the piano near its intended level, after which fresh measurements describe the instrument in its new state more accurately.
Pitch lowering needs the same thinking in reverse
Overpull is usually discussed around flat pianos because pitch raising is the common case. The underlying problem is broader. When a piano sits above the desired pitch, lowering many strings changes total tension too, so earlier notes can move while later notes are brought down.Professional tuning software can compensate during pitch lowering as well as raising. Instead of overshooting sharp and expecting the note to fall, the temporary target can move beyond the desired pitch in the opposite direction. The sign changes, but the reasoning does not.
Simply placing every sharp note directly on its final target during a large lowering pass can leave earlier work displaced by the time the rest of the piano is finished. A compensated rough pass anticipates that interaction, then a fine pass handles the smaller errors that remain.
A rough pitch correction is designed to redistribute tension efficiently and leave the instrument close enough for accurate fine work. Final tuning still benefits from fresh measurements, stable pin setting, careful unisons, and another check of notes that moved after their first adjustment.
