1. Choose Your Tonic HEADPHONES -OR- STEREO SPEAKERS (L+R) are required for any effectiveness. Single-ear applications will not work (such as: single earpods or single monospeakers – those will not work).Subwoofers, body Woojers, and low-end thumpers are encouraged for full immersion. 15Hz BETA WAVES < Select this for awakening to full awareness, alertness, concentration, thinking and studying. 12Hz ALPHA WAVES < Select this for relaxed focus, creative flow, and mental clarity. 8Hz THETA WAVES < Select this for calm, relaxation, tranquility, day dreaming and winding down. 4Hz DELTA WAVES < Select this for power naps, deep meditation, and help falling asleep.