We can create binaural beats ( monaural beats) by using two instruments that are a few hertz apart in sound. You can create this effect with singing bowls and gongs.
These two Chinese Chau gongs create DELTA WAVE - BINAURAL BEATS because their fundamental notes are only 3 hertz apart. Listen to the video. Can you hear the beat, 1 2 3, 1 2 3, 1 2 3? You are hearing the 3 hertz delta wave binaural beat. Delta waves are the brain waves registered when you are in a deep meditation or sleep. The theory behind listening to these waves is that you are entraining your brain to remember that pattern, to entrain it, which in turn can help you reach a better sleep or deep meditation. If you already have a gong or singing bowl and would like to have a second instrument to make the brainwave patters, I can help you with that too.