System/Library/Frameworks/AVFAudio.framework

AVAudioUnitVarispeed.h

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1. NSObject
2. >
3. AVAudioNode
4. >
5. AVAudioUnit
6. >
7. AVAudioUnitTimeEffect

@interface AVAudioUnitVarispeed : AVAudioUnitTimeEffect

@property (nonatomic) float rate;

- (id)init;

@end