Air Horn and other loud, obnoxious sound FX There are only 4 sounds in this simple app. Air horn, air raid siren, ship's fog horn, and car horn. Many of these sorts of apps have WAY too many sounds. This is purposely very simple and to the point. My intention with this app is to use it to wake my kids up once the school year starts. I'm not kidding about this. Sounds are set to full volume as per your phone's primary settings. A future update will include a local volume control.