Produce the vowel sounds of A, E, I, O and U with your mouth. Let your jaw hang loose and force air through your windpipe. Move your tongue up and down to create the vowel sounds of the English language. Articulate both the long and short forms of the vowels.
Move your jaw up and down slowly to change the size of your mouth as the vowel sounds are produced. Changing the size of the hole air is passing through changes the timbre of the sound. This variety of oscillation is the principle on which a traditional Talkbox operates.
Create the "wah" sound of a talk box by pursing and expanding your lips as you produce the vowel sounds and move your jaw. Changing the shape of your mouth changes the sounds produced by your voice. Begin with a small "O" shape and expand that shape until your lips are open as wide as possible.
Add pitch to the vowel sounds by constricting and expanding your vocal chords. As you produce the vowel sounds, move your jaw and change size of your lips. Tighten your vocal chords to produce a higher pitch and loosen your vocal chords to produce a lower pitch as you would while singing normally.
Assign each of the vowel sounds a pitch and synchronize the movement of your jaw, the change in pitch and the oscillation of your lips. Begin each sound with your jaw closed and lips close together and finish each sound with your lips apart and jaw open.