To anyone with the app "alarm clock pro" add this WAV file to your music directory, go to the app, make your alarm, select music, and select this one. Then go to advanced options and touch "fade in 1 minute"
volume on max.

the WAV file

the file is 1min 15secs long, and the alarm is only for the first 5 seconds, it will fade after a minute, and you won't hear anything.