U / OO — root tone
grounding vowel
A low U or OO vowel is used here as the grounding end of the modern toning ladder. The pelvic-floor placement is a symbolic attention anchor for the exercise, not a claim that the vocal tract produces sound in the pelvis.
Point 1 of 7 in Vowel-Chakra Toning
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Jonathan Goldman, Healing Sounds (secondary)
Modern sound-healing source for vocal toning; it does not establish this exact centre coordinate.
James D'Angelo, The Healing Power of the Human Voice (secondary)
Modern voice-work source for vowel exercises; this body placement is an editorial synthesis.