Have a notification /ringtone app. One version of the app uses isolated storage. User presses a sound button, it should quickly download in the background and then play. After that point, it stays in isolated storage. You can then long press to save or short press again to play the sound, even without a network connection.
*EDIT*
It now seems some users anywhere experience crashing when trying to play the sound. I may have narrowed I down. I hope. If you are on WP 8, this may be the cause. If you try it and it works or crashes please tell me if you have 8 or 8.1. I did confirm atleast one person with 8 tell me it crashes when trying to play a sound. I have 8.1 and it doesn't crash.
Tonality | Windows Phone Apps+Games Store (United States)
*EDIT*
It now seems some users anywhere experience crashing when trying to play the sound. I may have narrowed I down. I hope. If you are on WP 8, this may be the cause. If you try it and it works or crashes please tell me if you have 8 or 8.1. I did confirm atleast one person with 8 tell me it crashes when trying to play a sound. I have 8.1 and it doesn't crash.
Tonality | Windows Phone Apps+Games Store (United States)
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