For First Responders · Equal Temperament
Equal Temperament for an organ pipe
Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate an organ pipe live below — adjust the inputs and watch it respond, right in your browser.
Equal Temperament vs Just IntonationLive
the compromise of tuning
Controls
Presets
Just intonation tunes intervals to pure whole-number frequency ratios, which sound perfectly consonant but only in one key. Equal temperament divides the octave into 12 identical steps so every key works, at the cost of every interval except the octave being slightly out of tune. The bars show that compromise in cents.
Data Inspector
Equal-temp fifth392.0 Hz
Just fifth (3:2)392.4 Hz
Fifth error−2 cents
Major 3rd error+14 cents
Governing equation
Reading this result: The equal-tempered fifth sits at 392.0 Hz versus the pure 3:2 fifth at 392.4 Hz — only about 2 cents flat, which the ear forgives; the major third, however, runs a far more audible 14 cents sharp, the price of making every key playable.
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Frequently asked questions
- Is this good for first responders?
- Yes — this version of "Equal Temperament for an organ pipe" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.