title: AudioKit bounce recording sync
body: <p>I need help with an issue... I am recording a bounce with renderToFile, in AudioKit 4 and an artist has complained that the different tracks are not aligned to the sample. In preRender, we have a list of players with the different tracks and records that are set to play in succession, the problem is that I cannot set the AVAudioTime scheduling because it crashes, I suppose due to the fact of the engine being in manualrenderingmode. Is there a way to sync them to the sample? I suppose this is an issue tied to the underlaying AVAudioEngine...</p>
  <p>I cannot use AVMutableComposition because we need the recording to be exactly as the one played by AudioKit, and volume would differ.</p>