Once you find the resonance center, expand it to different tones.
Now let’s take that resonant “hmm” sound on a sing it on three tones going up and then back down. Be sure to take a good breath through your nose, using your diaphragm between each exercise.
It goes like this.
The goal of these exercises is to locate the resonance center in your head, and then learn to maintain it through all of the vowels.
Ready, let’s start with the “hmm”