“The student who never found the ghost,” she said. “I blew only into the hole. I made pretty sounds. Pretty, empty sounds. Bernold’s last lesson—the one they never print—is that beauty comes from kissing the wall, not the opening.”
"The quality of the sound is determined 80% by the embouchure and 20% by the air speed." Philippe Bernold La Technique D 39-embouchure Pdf
: Building a rich, dark sound in the footjoint range. “The student who never found the ghost,” she said
If you were actually looking for the real PDF or a technical breakdown of Philippe Bernold's embouchure method (which exists as a real pedagogical work for flutists), let me know and I can help summarize the authentic techniques instead of a ghost story! Pretty, empty sounds
Tone changes are often more obvious to a listener than to the player.