ios - How to write Output of AUGraph to an External AudioFile of WAV or AIF formats? -

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In my iOS app I am playing a MIDI file using music player; Music sequence and I'm getting AUGraph by calling the Music Sequence "Music SuctionGetAugraph" method. I now want to save the same output of this AUGraph in an external file. How can I do that? Can anyone help me?

Here I am not using any node to create AUGraph. I am getting a graph directly from the music sequence

thanks in advance.

Here is my AUGraph

AudioGrift 0x246104F:

Member Nodes: 

  node 1: 'OMU' 'SAP 'Ap', example 0x1c558830 oi node 2: 'au' 'rooc' 'ap, example 0x1c54a550 oi   
 connection:  
  node 1 bus 0 = & gt; Node2 bus 0 [2CH, 44100Hz, 'LPCM' (0x00000029) 32-bit small-endian float, Dinterlev]   
 CurrentState: mLastUpdateError = 0, eventsprocess = F, isRunning = T (1)   
 
 
 An example of writing AUGraph output for a file is  < / Div>

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