title: iOS speaker volume decreases when using microphone in Unity game
body: <p>In my iOS game I notice the speaker volume automatically decreases while I'm recording with the mic. I'm using the following C# code in Unity 3D to record a short piece of input from the mic and then analyze audioSrc to see if there was any blowing. I repeat this for a short while.</p>
  
  <pre><code>        audioSrc.clip = Microphone.Start (null, false, 5, FREQUENCY);
  </code></pre>
  
  <p>The whole time I'm also playing some background music, and it is during the execution of the above command that the music volume drops for a bit and then comes back right after recording stops.</p>
  
  <p>I'm not sure if this is specific to Unity 3D on iOS only, or whether this is behaviour common to iOS applications. I haven't noticed the same behaviour on Android. Does anybody know of a way I can prevent this on iOS? If necessary I can execute Objective-C code from Unity to call the iOS APIs.</p>