PushTone is a tweak that allows you to change the default Push Notification sound for any app that uses them, like Facebook, Skype, or TweetBot. These can be edited using iFile, but this tweak simplifies it by giving you a simple, familiar interface, and a large list of sounds to choose from. You can revert back to the original sounds just by disabling the tweak in it's settings. This does require iOS 5.

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This tweak is available for $1.99 from the BigBoss repo.