System/Library/Frameworks/AVFAudio.framework

AVAudioUnitEffect.h

NSObject
>
AVAudioNode
>
AVAudioUnit

@interface AVAudioUnitEffect : AVAudioUnit

@property (nonatomic) BOOL bypass;

- (id)initWithAudioComponentDescription:(struct AudioComponentDescription { unsigned int x0; unsigned int x1; unsigned int x2; unsigned int x3; unsigned int x4; })a0;

@end