3 Hz Delta brainwave binaural beat royalty free sound effect (1 hour long tone) to use in relaxation or focus video, meditation, binaural beats sound design, sound therapy, and commercial business use. Delta frequencies (0.5–4 Hz) are typically associated with deep sleep and relaxation. Due to the size of the file, the download is only … Continue reading 3 Hz Delta Brainwave Binaural Beat (1 Hour)