I could see this being very useful in a number of applications.
Being trans, of course voice affirmation training.
Then singing comes to mind, followed by language learning.
A solid visual demo like this would help give people more than "okay now more like the a in aunt"
I pronounce it aunt but a lot of people pronounce it aunt.
The next step is clearly real-time MRI so you can more easily match the reference: https://seeingspeech.ac.uk/ipa-charts/
Huh, that wouldn't have occured to me. Thanks for a new perspective!