Soothing
This app provides good sounds along with helpful functionality. You can adjust the volume of the individual sounds then adjust the volume of the entire mix to the desired level. I am able to "produce" a soothing medley to play on my night stand. My ears are highly sensitive, and any noise or music will parent me from falling asleep. I use the timer in this app to set the sounds to play for 15 minutes. At the end of this period, I have loosened up enough to be able to fall asleep in the welcome stillness.
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TaoMix - Create your own Relaxing Ambience with Nature Sounds