A steady drum, held at an even pace, stops being a sound you listen to and becomes something you can travel on. Choose a voice, set how long you want, and sit or lie still. It will call you back at the end.
Five drums and three rattles to choose from. Set the length of the journey and it brings you back itself: a return signal first, then a faster callback. Rounds, fade in, pauses, speeds and volume are all adjustable, and settings can be saved as presets. Nothing is installed.