I am trying to smoothly fade in/out the output from a AVAudioPlayerNode that is connected to an AVAudioMixerNode. I can't figure out the best approach to smoothly ramp the player node's volume over time.
I see that there's a 'setVolumeRampFromStartVolume:toEndVolume:timeRange' method in the AVMutableAudioMixInputParameters class that is basically exactly what I'm looking for. However, there doesn't seem to be a use for this with an AVAudioMixing-compliant node like the AVAudioPlayerNode connected to an AVAudioMixerNode. If I were using an audio unit, I could theoretically connect a MusicTrack in a MusicSequence and automate parameters with a MusicPlayer instance. However, the AVAudioPlayerNode isn't an audio unit, so no luck there. Has anyone successfully automated the pan/volume when using the AVAudioMixing components? It's such a low-level-feeling component that I figured parameter automation would be possible. Mark Wise 646.241.7126
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