I wouldn’t personally recommend listening to delta wave frequencies for depression, so I’m not sure who advised you to do that? People with depression usually have a higher ratio of theta and delta wave activity, so I would normally recommend listening to high alpha wave and low beta wave frequencies, to help balance things. I have some 10Hz alpha tracks for serotonin release, which you can try for free on my YouTube channel here: https://www.youtube.com/watch?v=3NSUcuzpRcY&list=PLveg0IEcZWN6T86nhmSrdwG2kMQtcLRou. I also recommend you give these SMR (low beta wave) tracks a try: https://www.youtube.com/watch?v=HGTvBbrEwZQ&list=PLveg0IEcZWN7yaMaKr8F-eWHALk2_zGqY. I hope that helps.
This unique session works the opposite to most sessions. It attempts to  ‘dis-entrain’ the brain, breaking stuck thinking patterns and allowing a fresh way of thinking. The recording contains random and chaotic isochronic tones spanning 7.83 to 18 Hz, played over a background of gamma-embedded noise. Use this session to sit back and allow fresh ideas and new connections to form. Finishes at the illuminating14Hz sensorimotor rhythm frequency.
Another uncontrolled study asked eight adults to listen to a binaural beat CD with delta (1 to 4 Hz) beat frequencies for 60 days straight. The participants filled out surveys before and after the 60-day period that asked questions about their mood and quality of life. The results of the study found that listening to binaural beats for 60 days significantly reduced anxiety and increased the overall quality of life of these participants. Since the study was small, uncontrolled, and relied on patient surveys to collect data, larger studies will be needed to confirm these effects.

With its focus on full, cleansing breaths, deep breathing is a simple yet powerful relaxation technique. It’s easy to learn, can be practiced almost anywhere, and provides a quick way to get your stress levels in check. Deep breathing is the cornerstone of many other relaxation practices, too, and can be combined with other relaxing elements such as aromatherapy and music. While apps and audio downloads can guide you through the process, all you really need is a few minutes and a place to stretch out.
By this point, it seemed like organoids with a living blood supply looked more like a human brain in terms of structure than they had ever looked in a dish because they were able to survive long enough to develop properly. However, the question still remained as to whether the neurons and their synapses were functional. Neurons are electrically excitable cells that receive, process and transmit information through electrical  and chemical signals. Calcium plays an important role in the transmission of electrical signals from one neuron to the next. Changes  in the levels of calcium at the end of neurons can be measured using calcium-sensing proteins that light up red. When the scientists looked through the glass window in the skulls of the mice, they were able to see that neurons did have fluctuating levels of calcium, suggesting that  neurons in the brain organoids were active. To be sure, they used electrodes to directly measure the electrical activity of the implanted organoid at different places and during different times of development, and discovered that the neurons were able to electrically stimulate each  other and respond to stimuli from the external environment.The researchers had succeeded in creating fully functional brain organoids. Then things got really interesting.
It is important to take an objective look at published scientific evidence to determine whether brainwave entrainment is an effective treatment for certain conditions and/or symptoms. Most preliminary evidence suggests that while the technology will not cure any condition, it may be a successful adjunct treatment when used carefully with the proper protocol.
Targeted hemispheric changes: Some speculate that specific alterations in brain waves can be made on an individual basis. In other words, you can target one frequency in one hemisphere (via the right ear) and another distinct frequency in the other hemisphere (via the left ear). The left ear affects the right hemisphere and right ear affects the left hemisphere.
Theta brainwaves are next highest in frequency above delta and are especially important for many people using brainwave entrainment and meditation because theta waves are at a threshold, forming a link between wakefulness and the subconscious mind. Theta waves bridge between our awake self and the creative and insightful understandings from below our conscious awareness, and while they are not common in awake adults, they are normative for children under 13 years old. 

A high quality binaural beat MP3 inspired by the brainwave patterns of Zen meditators. A deep ambiance of strings with opera tones can be heard. This MP3 is inspired by the work of Maxwell Cade and his research with experienced Zen meditators. Cade noticed that this pattern emerged after deeper Zen meditations, and so this is often called the “afterglow of meditation.” Note: that this recording uses binaural beats. – headphones are required. Please remember to never listen to this music whilst driving or operating machinery of any kind.
“Wow, wow, wow! When I coach people, the first thing I do is help them change their state as quickly as possible – and now it’s as easy as using one of the Brain Salon sessions. I can’t wait to share this program with all of my clients – once they use Brain Salon to easily get into a powerful state, then the work I do is going to take them to levels they never imagined possible…”