Here is an interesting MRI video of the organs of speech at work, produced by scientists at the Magnetic Resonance Engineering Laboratory of the University of South California.
It shows two performers in action.
One is an opera singer doing her thing (O mio babbino caro) and then demonstrating different vowel sounds at different pitches. We see how the vowel space appears to shrink with rising pitch.
The other is a beatbox emcee making what the commentary calls percussive sounds. These seem to be more accurately stops made mainly with various non-pulmonic airstream mechanisms. It is difficult to identify them with certainty, but they mostly seem to be clicks and reverse-clicks, i.e. made with an ingressive or egressive velaric airstream; some are probably implosives or ejectives, i.e. made with an ingressive or egressive glottalic airstream.
Listen and repeat after me. (The account given here really doesn’t help much.)