Magic happens with this amazingly deep meditation MP3. Delta stimulation can be very hypnotic, and Sub-Delta (0 – 1 Hz) in particular is theorized to have soothing effects on the limbic system, such as the amygdala and hypothalamus which themselves operate at delta frequencies. These neural structures are associated with emotions, fear, the fight-or-flight response, blood pressure, tension and more. Many people have found success using Delta as an aid in meditation. Using sub-delta to sooth these structures has resulted in amazing success helping health conditions such as fibromyalgia, chronic pain and hypertension (high blood pressure). Its soothing effects on the limbic system may shed some light on this.
With digital upgrades, Berger’s machine is still in use today, known as an electroencephalography machine, or EEG. Berger used his machine to study the brains of psychologically normal and abnormal people and discovered the first brainwave, called the alpha wave and also known as the Berger wave, along with the faster beta wave, which he observed suppressing the alpha wave when subjects opened their closed eyes. 
I can offer a hypothetical--however do not know know practical it will turn out to be. There is a fair amonut of bad science on this topic on you tube. The gamma wave frequency is associated with attentional focus and arguably a unified sense of self. If it could be entrained it should lead to a meditative focus-like exceptionally well-trained meditators. Some but not all studies on meditating Buddhist monks suggest this is so. Does this really and more generally occur--I will say there is nothing lost in trying--we all go into a 40Hz range on occasion without ill effect-- but I would not put confidence in the purported methods out there at present. Good luck.

With these studies in mind, EquiSync's revolutionary, multi-layered, multi-tiered approach was born. Designed to synchronize and harmonize your brainwaves while allowing you access to the deepest, most pleasurable, most beneficial states of meditation — much faster than the traditional route, EquiSync® has made mastering meditation easier than ever!

After the illness, I returned to school and found out that I couldn’t understand what the teacher was saying. Or what people were saying to me in general. Then I had difficulty comprehending math (which I was excellent at before). Then my reaction time just CRASHED. I was also classified by new teachers as “flighty”, “in a dream world”, “not mentally engaged”, as my brain began to stay in a state of sleepy-but-unable-to-sleep mode.
Deemed as the “the most relaxing brainwave”, delta waves are at their most active when you’re not- they appear when you’re asleep and reduce your overall sense of awareness. Associated with the sub-conscious to unconscious parts of the mind, delta brainwaves are said to be the opening to non-physical states of reality. As a result, this brain state is most often seen while one is in very deep meditation or dreamless sleep.
Brainwave entrainment music can be used almost anywhere and anytime, making this mood and self-improvement method versatile and flexible enough to do at work, while traveling, or at other times during the day. When used in the workplace during short rest periods, brainwave entrainment techniques can enhance concentration, communication, and work productivity.
Maybe a favorite popular song, a certain piece of Classical music, a raucous dance beat, the pulse of Reggae, Indian, or African drums, or the chanting of Gregorian or Tibetan monks, but you probably know how the sound of music, drumming, or chanting is capable of transporting you into an altered and joyous state of mind and uplifting your spirits.

This session shifts from the 14Hz sensormotor rhythm through beta to 40Hz gamma, and repeats the pattern over and over, constantly “revving up”the mind with each repetition. The process is stabilized with a 10Hz background alpha beat, allowing the brain a place to relax instantly, whenever a let up allows. Use this session any time, and for as long as required to get the job done. Take in a High Energy Espresso on long-hauls for a welcome lift. Works without headphones, but the best benefits can be found with them. The session finishes at a fast, revving 18Hz beta. For use mainly with eyes open, engaged in activity - with benefit to be gained from periodically closing your eyes briefly and relaxing.