One function that is lost iOS pushs customizing ringtones. User has no other way than to listen to those imposed by developers in the applications or failing that of Apple. It is now ancient history with the Tweak PushTone. You will be able to customize your iDevice a bit more by changing the sound of notification pushs.
Once installed the tweak, go to Settings and then Notifications. In the application list, choose the one you want to modify and press the "Push Tone" and select the sound you want to apply ..
Source : Top Cydia
PushTone is available on Cydia under BigBoss source at a price of $ 1.99