The 515 LoopLogic CD: The 515 LoopLogic is a 74 minute, 37 track compact disc of dual binaural beat audio frequency sessions. Each track is 2 minutes long, with track 1 being in the 1Hz. frequency range, track 2 being in the 2Hz. frequency range and so on, to track 37, which is a 2 minute audio session in the 37Hz. range. Unlike the 8-bit sound generated by light/sound instruments, the dual binaural beats of the 515 LoopLogic is in 16-bit sound, with the frequencies of each track guaranteed to fall within the parameters of the corresponding frequency range, allowing you complete entrainment control. LoopLogic refers to programming your CD player. To increase the length of any track/hertz in 2 minute intervals, simply press the repeat button on your CD player. Or you can choose a variety of tracks/hertz for creating dual binaural beat audio sessions. The 515 LoopLogic CD is the perfect companion for EEG Neurofeedback training. It has been observed that when combining specific tracks/hertz of the 515 LoopLogic with EEG/neurofeedback training, the participant's ability to achieve the targeted brainwave state is enhanced, enabling the therapist to maximize each client's neurofeedback training session. Whether you are a  therapist, session designer or mind explorer, the dual binaural beats of the 515 LoopLogic will take you, your listeners or your clients to the exact brainwave state you select. 74 minutes. 37 tracks. 37 specific brainwave frequency sessions.