It makes stretch visible
Instead of talking about stretch in abstract terms, the curve gives a practical picture of how the instrument behaves.
Concept guide
What is a Railsback curve.
A Railsback curve is a visual way to show how piano tuning targets deviate across the keyboard on a real acoustic instrument. It helps explain why purely ideal equal-temperament targets do not always sound right in practice.
What the curve shows
- How tuning targets shift across the bass and treble.
- Why acoustic pianos are not tuned as perfectly ideal strings.
- How stretch appears as a practical pattern, not a theoretical abstraction.
- Why octave relationships often need more than a simple pitch-only reading.
Why the Railsback curve matters
It supports better decisions
When you can inspect the pattern, it is easier to understand how the piano should be approached during tuning.
It reinforces that every piano is not identical
Different instruments can show different behavior, which is why sampled context matters.
How Tempera helps
- Sample the instrument instead of assuming one generic curve.
- Inspect stretch behavior in the Lab workspace.
- Use that context during the tuning session.
- Save the profile for future visits to the same piano.
Frequently asked questions
Is a Railsback curve the same on every piano?
No. Different scales, string behavior, and instrument condition can change the observed pattern.
Is the Railsback curve only for technicians?
Technicians use it most directly, but it is also a useful concept for anyone trying to understand why piano tuning is not just note matching.
Does the curve replace listening?
No. It gives structure and context, but musical judgment is still part of the tuning result.
Use Tempera to inspect stretch behavior instead of guessing it.
Install Tempera if you want Railsback-style context, inharmonicity analysis, and saved piano profiles in one workflow.