Ive probably been using this app for 6 or 7 years now and I still love it. Need to drown out background noise? Check! Want to set a tranquil environment? Check! What about meditative sounds or chants? This has got you covered!
Personally, when I cant sleep I like to listen to my favorite rain or other nature sounds, but I mostly use pink noise when I have study on the train.
Duzzenmatta about Ambiance, v3.5.1