This app is just awesome. You can play different tones, sounds, melodies and combine at will. The quality of the sound is excellent and you can hear no repeat cuts. There is a quiet, pleasant and less pleasant, loud sounds, for every taste something. In addition, even meditative tones that only through headphones are partially audible and address the subconscious. There are also ready-made mixes or one can even put together and which store and play as fast. There are a number of settings and the operation is really easy. Just wonderful to sleep, relax or otherwise running the way. From vocal about whale songs, campfire, rain, storm, city noises to birdsong and underwater noise is really something there. Tip Top! Highly recommended.