Good app, but needs some features

A good app, but since it does not function in the background, I cannot use it 90% of the time. Once you switch to another application such as iBooks, etc. Soundcurtain stops generating noise. If they added background functionality and improved reaction speeds to block ambient noise, it would be a 4-5 star app. Also, it would be nice if the app worked better with the iphones built-in microphone and speakers (it currently seems to require a plug-in headset to work properly). As is, I give it 2-3 stars.

Anonymous453 about SoundCurtain