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    <p>Here is the solution.</p> <p>setVolumeRampFromStartVolume doesn't work.</p> <pre><code>AVMutableAudioMix *exportAudioMix = [AVMutableAudioMix audioMix]; AVMutableAudioMixInputParameters *exportAudioMixInputParameters = [AVMutableAudioMixInputParameters audioMixInputParametersWithTrack:track]; </code></pre> <p>//fade in</p> <pre><code>[exportAudioMixInputParameters setVolume:0.0 atTime:CMTimeMakeWithSeconds(start-1, 1)]; [exportAudioMixInputParameters setVolume:0.1 atTime:CMTimeMakeWithSeconds(start, 1)]; [exportAudioMixInputParameters setVolume:0.5 atTime:CMTimeMakeWithSeconds(start+1, 1)]; [exportAudioMixInputParameters setVolume:1.0 atTime:CMTimeMakeWithSeconds(start+2, 1)]; </code></pre> <p>//fade out</p> <pre><code>[exportAudioMixInputParameters setVolume:1.0 atTime:CMTimeMakeWithSeconds((start+length-2), 1)]; [exportAudioMixInputParameters setVolume:0.5 atTime:CMTimeMakeWithSeconds((start+length-1), 1)]; [exportAudioMixInputParameters setVolume:0.1 atTime:CMTimeMakeWithSeconds((start+length), 1)]; exportAudioMix.inputParameters = [NSArray arrayWithObject:exportAudioMixInputParameters]; // configure export session output with all our parameters exportSession.outputURL = [NSURL fileURLWithPath:filePath]; // output path exportSession.outputFileType = AVFileTypeAppleM4A; // output file type exportSession.timeRange = exportTimeRange; // trim time ranges exportSession.audioMix = exportAudioMix; // fade in audio mix // perform the export [exportSession exportAsynchronouslyWithCompletionHandler:^{ if (AVAssetExportSessionStatusCompleted == exportSession.status) { NSLog(@"AVAssetExportSessionStatusCompleted"); } else if (AVAssetExportSessionStatusFailed == exportSession.status) { NSLog(@"AVAssetExportSessionStatusFailed"); } else { NSLog(@"Export Session Status: %d", exportSession.status); } }]; </code></pre>
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