You do not run beta waves. Beta waves are your normal brain state when you are awake. But with that generator, you can listen to sub with any brain state even when you awake.
Delta brainwaves (1-3 Hz) are the slowest, highest amplitude brain waves, and are what we experience when we are asleep. In general, different levels of awareness are associated with dominant brainwave states.
Theta brainwaves (4-7 Hz) brain waves represent a day dreamy, spacey state of mind that is associated with mental inefficiency. At very slow levels, theta brain wave activity is a very relaxed state, representing the twilight zone between waking and sleep.
Alpha brainwaves (8-12 Hz.) are slower and larger. They are associated with a state of relaxation and represent the brain shifting into an idling gear, waiting to respond when needed. If we close our eyes and begin picturing something peaceful, there is an increase in alpha brainwaves.
Beta brainwaves (13 – 38 Hz) are small, faster brainwaves associated with a state of mental, intellectual activity and outwardly focused concentration. This is basically state of alertness.
Gamma brainwaves (39 – 42 Hz) are the fastest and most subtle brain waves. Gamma rhythms modulate perception and consciousness.