The distinctive pulses of isochronic tones are designed to rapidly alter your brain activity.
The most effective brainwave state isochronic tones help to produce is the alpha brain-wave state, which is often associated with meditation, focus, and clarity.

Isochronic Tones

The Younger Cousin of Binaural Beats

In the simplest sense, an isochronic tone is actually just a single tone that is being rapidly turned on and off in particular patterns, designed for inducing different brainwave states.
In between each tone, there is absolutely no sound being produced. There is just a single unchanging tone. But what is unique is the rapid volume change of the tone.
It goes from 0 to 100 and then back again in volume in an evenly spaced way.