I had a bit of problems with this app after one of the ios changes; but now its all better. The new version adding the fourth selection was pretty cool and gave me many more options. The best part is that I can select sounds that cover or mask irritating sounds such as my wifes snores and my two dogs snore all of which are at a different frequency. With this app I can assign different sound masks and I can five they could sleep. Thank you for A wonderful wonderful app.
Relaxedinbiglou about Sleep Machine, v4.1