What accuracy means in key detection
An accuracy percentage needs a defined test set, reference labels and scoring rule. Without those, it cannot establish which detector will work better on your material.
In this guide: SESSION™ Key. Apple silicon · macOS 14.4+ · Up to 3 Macs. Price and requirements.
Published by Capiscana, Inc., maker of SESSION™ products. About these comparisons.
On this page 8 sections
Define the task
Whole-track key, local key, chord recognition and single-note pitch are different tasks. A result on one should not be presented as proof on the others.
Publish the counting rule
Exact matches, enharmonic equivalents and partial credit for related keys produce different totals. State how ambiguous or changing-key tracks are handled before measuring.
Separate confidence from correctness
Confidence describes an analyzer’s assessment, not an independently verified probability of correctness unless calibration has been demonstrated. A display can be confident and wrong.
Test the workflow too
A useful evaluation includes the actual input, passage, version, result and intended destination. These pages compare published capabilities; they do not claim a measured accuracy winner.
Using SESSION™ Key
Read system audio, use the microphone, or drop an audio or MIDI file on the menu bar. Live analysis follows the passage playing; a file gives the analyzer a different span of material.
The outline marks a locked reading; green and amber communicate confidence separately. A locked reading can still be uncertain. Listen, check the musical context, and use the half-time or double-time control when the pulse needs it.
Put the result to work
Key and tempo in Pro Tools · Use Key with Ableton Live · Check a reading you do not believe · Compare analysis tools
Sources and scope
Product documentation reviewed October 17, 2026. These are comparisons of published capabilities, not independent performance tests. Prices and availability can change.
The musical explanations are editorial guidance; the product source supports the descriptions of Key. Check a disputed tonal label against the actual music.