Save audio file with changed time pitch using AVAudioEngine in Swift

Question

Currently, I am trying to change the time pitch of an existing audio file from the Document folder, then override the old file with the modified one using AVAudioEngine. I have got the first part working using AVAudioPlayerNode and AVAudioUnitTimePitch. I have no idea about the second part though. Can someone point me to the right direction?

Thanks.

Maseru

Are you still looking for an answer to your question? – Cinquain

I'm looking for that answer, too!! Thank you! – Upheave

Did you ever figure this out? – Indisposed

Unfortunately no :( – Allot

still looking for an answer ? – Lunna