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    <p>Yes, it is definitely possible. Last I checked the Apple Core Audio docs were not very good, but it has been a few months since I've worked with it. Here are the steps that I would follow.</p> <ol> <li><p>Record the audio sample.</p></li> <li><p>Reverse the audio by looping through the first half of the array and swapping the value located there with one an equidistant from the end of the array.</p></li> <li><p>Play the resulting audio clip.</p></li> </ol> <p>Quite frankly, the first step is probably the hardest. <a href="http://trailsinthesand.com/exploring-iphone-audio-part-1/" rel="nofollow noreferrer">Here</a> is a decent article about doing audio on the iPhone including recording. Make sure you look at all of the different parts of the article. <a href="http://www.tuaw.com/2007/08/06/iphone-coding-recording-audio/" rel="nofollow noreferrer">Here</a> is another article about recording sound on the iPhone, but using a different framework. There are really several ways to go about recording on the iPhone though, last I checked, if you want to play audio while you are recording you have to use RemoteIO.</p> <p>Edit:</p> <p>If you would like to use RemoteIO(which I preferred), then <a href="http://atastypixel.com/blog/2008/11/04/using-remoteio-audio-unit/" rel="nofollow noreferrer">this site</a> is pretty helpful for getting started with it. Also, the <a href="http://developer.apple.com/iphone/library/samplecode/aurioTouch/index.html" rel="nofollow noreferrer">aurioTouch</a> sample program that Apple provides is immensely helpful (though more than you want). </p> <p>If you don't need RemoteIO (because it can be a major pain though it is more low-level and thus more flexible), then try the <a href="http://developer.apple.com/iphone/library/samplecode/SpeakHere/index.html" rel="nofollow noreferrer">SpeakHere</a> sample program. It is made just to record and play back. However, I just looked at it and it writes the recording to a file rather than a buffer which isn't what you want. I would recommend going with RemoteIO for that reason (unless you can find a way to have it write to a buffer instead).</p>
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    1. COSounds good in theory. Just have to figure out what array to manipulate.
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    2. COThanks for all the info. I'll check it out.
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