Learning to Beatbox? Here is the Human Beatbox Sound Archive entry for the Inward Ts Hi-Hat
Name: Inward Ts Hi-Hat
Family: T Based Sounds (T)
Description: This sound is made by bringing the the tip of the tongue up to the front of the hard palate, creating suction, then pulling in a small burst of air. It is similar to the sound made by a "t" and "s" together in English (as in cats), but it is created by air moving inward rather than outward. This sound is ingressive, meaning that it brings air into the lungs.
Other Links: About the Human Beatbox Sound Archive