How do I access Music Library audio data from an iOS app for processing and playback?

The goal is to have an app that gets audio files from your existing Music Library on your iPhone/iPad, applies some processing/mixing and plays it.


I know there is an API that allows to implement a basic music player that plays files from the library. But is there a way to access raw audio data for processing?

How do I access Music Library audio data from an iOS app for processing and playback?
 
 
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