Reference Pitch and A4 Calibration

Set A4 once, correctly, and every temperament choice becomes clearer, faster, and safer for ensemble work.

On this page

Why A4 comes before temperament
Common reference values and when they appear
A reliable calibration routine
How to detect a bad pitch context quickly

Why this matters

Reference pitch is your coordinate system. If that system is off, temperament comparisons become misleading. Two settings may seem different when the real issue is simply mismatched A4.

Common practical values

A=440: widely used modern baseline
A=442: common in many orchestral environments
Other values: use the ensemble, venue, or instrument requirement as authority

Historical performance practice can use lower or otherwise different references, but consistency inside the session is still the first priority.

Calibration routine (2–3 minutes)

Confirm the target A4 value from your musical context.
Set that value in Well Tempered before selecting temperament.
Run a short check on stable, familiar notes.
If readings wobble unexpectedly, resolve environment/noise issues first.
Only then begin temperament comparisons or fine corrections.

Fast diagnostics for wrong reference setup

Everything feels uniformly sharp/flat: likely reference mismatch, not interval problem.
A/B temperament tests make no musical sense: re-check A4 before changing anything else.
You keep “fixing” the same notes repeatedly: verify pitch context and stability conditions.

Reference Pitch and A4 Calibration screenshot — Reference setup phase: establish A4 first, then proceed to temperament and refinement.