Is it possible to use the iOS sound (and vibration) library to create custom notifications for an app, independent of standard iOS notifications, etc. as is made available to Airdrop, Facebook and Twitter? I would like to use 2-4 sounds in an app, distinct from other apps and standard iOS sounds like "Reminder Alerts", "Calendar Alerts", "Sent Mail", "Ringtone", "Text Tone", etc. I prefer not to have the app share sounds configured for "Reminder Alerts".