You're looking for information on Sudarshan Kriya, specifically the 20/40/40 audio program. Here's what I found:
The numbers typically refer to the or the relative speed of the breath during the three phases of the Kriya. The goal is to harmonize the breath with the body's natural rhythms. sudarshan kriya 20 40 40 audio top
Fast-paced cycles to release deep-seated stress and clear the mind. sudarshan kriya 20 40 40 audio top