@interface CSManualDuckingHandler : NSObject - (id)init; - (void)duckAudioDeviceWithDeviceID:(unsigned int)a0 duckedLevel:(float)a1 rampDuration:(float)a2; - (void)duckDefaultOutputAudioDeviceWithDuckedLevel:(float)a0 rampDuration:(float)a1; - (void)resetDucking; @end