Export audio filters in an AVMutableComposition

In my app I have a view that play a video (with an AVPlayer) recorded by the user and the sound of the video recorded (with an AEAudioFilePlayer) that I put on a channel and I apply some filters on it.

The problem is that when I want to export the video with the audio AND the filters on it, I don't know how to do. I export the video with the help of an AVMutableComposition but how can I include the audio with filter in it ?

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