The inward zipper is a tight squeaking noise that also couples as a inward breathing technique.
It really helps to learn the Balloon Squeak or Inward Lip Oscillation { ^pp } first, so be sure to check that tutorial out too!
Standard Beatbox Notation (SBN)
{ ^PP }
How it's done
- Learn the Inward Lip Oscillation { ^pp }
- Force it inwards from the side of your mouth
- Keep it short and sharp