V a ʊ ə l

Harmony by ear — drag on the vowel space to sing.

Articulation calibration → 3-D acoustic lab →
Voices
Engine
Mode
Vowel V Pitch P Chord C
0.00 s
BreathyVoiced
0.60
Wide larynxNarrow
0.76
1.45×
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Vocal Tract

Press and hold P for pitch, C for chord, Shift to spread the quartet. 14 mute individual voices.