Amazing. You can fine tune the audio to suit your needs. You don't just get white  pink or brown noise  you can get an entire spectrum. I suffer from Tinnitus so the ability to create an audio signal that I can use with my tinnitus and produce sounds that really do help me to sleep. I would give it more than 5 stars. It would be nice to be able to save an audio signal to an mp3 file of maybe up to an hour?
February 24 2017