↩

Vowels

ipa formant synthesizer

front central back close open

Vowel

Speaker

Phonation

Advanced

Keys

Chart keysplay vowel
Arrowsmove dot
Wheelbend pitch
Shift \ Pstep back
Shift /shuffle all
Shift ⌫silence

Credits

Chart and voice

Songs

Every tune is in the public domain. Where the notes were read from a score or a setting someone else prepared, it is linked. The tunes were moved to keys that fit the voice, and the harmonies for three voices were made for this page.

AI disclosure

The code, tests, song transcriptions, and harmonies were written with Claude Code using Opus 5.5, from 11 to 13 October 2026. Each feature and change was directed and reviewed by the author, and the sound was judged by ear. Claude also found the sources above and checked the synthesizer's defaults and resonator formula against Klatt's original Fortran. The formant values are Catford's. F3, the voice settings, and the faces are estimates with no source. Links and sources were double-checked against the originals on 13 October 2026.