This is the developer. Noi is tested only for Mac OS X 10.5.8. MacUpdate's screenshots suggest it may have bugs for other versions of OS X:
For example, there are 2 soundscapes packaged with the app, but the screenshots do not show them installed. Also, you might have to resize the settings window to make the scrollbar appear :-/
If you do or don't have these problems with your version of OS X, your input is appreciated.