Three strings.
One reading.

Unison

No mute strip.
No felt wedge.

Every string in the unison gets its own scale, its own cents, its own confidence reading. At the same time, off one microphone.

• 1−2.4 c783.15 Hz
• 2−0.5 c786.27 Hz
• 3+1.4 c786.92 Hz

Read off one frame of the film above.

Inharmonicity

Every piano lies differently.

Record the instrument's own inharmonicity note by note. The keyboard fills in behind you as each measurement lands, and the coefficient curve builds from the partials it actually heard.

88 notes.
One curve.

The readings resolve into a single tuning curve, and that curve becomes the live target on the tuner page. Temperament, tuning style and concert pitch all feed it.

Pitch raise

For a piano far below pitch.

The overpull pass predicts how much each note will settle as the rest of the pass adds tension, then tunes above the final target so the piano lands on it.