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    <p>I tackled this problem using an NSOperation subclass so fading the volume doesn't block the main thread. It also allows fades to be queued and and forgotten about. This is especially useful for playing one shot sounds with fade-in and fade-out effects as they are dealloced after the last fade is completed.</p> <pre><code>// Example of MXAudioPlayerFadeOperation in NSOperationQueue NSOperationQueue *audioFaderQueue = [[NSOperationQueue alloc] init]; [audioFaderQueue setMaxConcurrentOperationCount:1]; // Execute fades serially. NSString *filePath = [[NSBundle mainBundle] pathForResource:@"bg" ofType:@"mp3"]; // path to bg.mp3 AVAudioPlayer *player = [[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:filePath] error:NULL] autorelease]; [player setNumberOfLoops:-1]; [player setVolume:0.0]; // Note that delay is delay after last fade due to the Operation Queue working serially. MXAudioPlayerFadeOperation *fadeIn = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:player toVolume:1.0 overDuration:3.0]; [fadeIn setDelay:2.0]; MXAudioPlayerFadeOperation *fadeDown = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:player toVolume:0.1 overDuration:3.0]; [fadeDown setDelay:0.0]; MXAudioPlayerFadeOperation *fadeUp = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:player toVolume:1.0 overDuration:4.0]; [fadeUp setDelay:0.0]; MXAudioPlayerFadeOperation *fadeOut = [[MXAudioPlayerFadeOperation alloc] initFadeWithAudioPlayer:player toVolume:0.0 overDuration:3.0]; [fadeOut setDelay:2.0]; [audioFaderQueue addOperation:fadeIn]; // 2.0s - 5.0s [audioFaderQueue addOperation:fadeDown]; // 5.0s - 8.0s [audioFaderQueue addOperation:fadeUp]; // 8.0s - 12.0s [audioFaderQueue addOperation:fadeOut]; // 14.0s - 17.0s [fadeIn release]; [fadeDown release]; [fadeUp release]; [fadeOut release]; </code></pre> <p>For MXAudioPlayerFadeOperation class code see <a href="http://www.mackross.net/2010/12/fading-audio-with-avaudioplayer/" rel="noreferrer" title="my blog post">this post</a>.</p>
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    1. COThat link is dead. Does anyone have a copy hosted anywhere else?
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    2. COThat original code is long gone however it's been improved on and used elsewhere on stack overflow http://stackoverflow.com/questions/12435849/how-to-cross-fade-between-avaudioplayers
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