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copied!<p>This is a bit old, but this post helped me and I wanted to update it for anyone else who might need it in the future. The code posted at the top is correct - it will take the quiet audio that's being played through the phone speaker and route it to the loudspeaker at the bottom. There is a minor typo in the code, which is why it's giving errors. Here is the correct snippet which will solve this issue:</p> <pre><code>UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride); </code></pre> <p>Make sure you also activate the audio session right after setting this, before creating your audio player/recorder:</p> <pre><code>[[AVAudioSession sharedInstance] setActive:YES error:nil]; </code></pre> <p>Last, if you're going to be playing and recording at the same time you'll probably need to set the category and mixing functions too. Here's the entire snippet which will set the category, enable mixing, route the audio to the main speaker, and activate the session. You'll want to do this only once right after the app launches.</p> <pre><code>[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; OSStatus propertySetError = 0; UInt32 allowMixing = true; propertySetError = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing); UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride); NSLog(@"Mixing: %x", propertySetError); // This should be 0 or there was an issue somewhere [[AVAudioSession sharedInstance] setActive:YES error:nil]; </code></pre> <p>Hope that helps someone!</p>

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