title: iOS How can I record internal audio?
body: <p>Is it possible to record background sound by an app? If so, what is the key technology? (Core Audio?)</p>
  
  <p>What I want to do is below..</p>
  
  <ol>
  <li>Open BBC radio on safari.</li>
  <li>Open the recording app. At the time, safari runs in the background.</li>
  <li>Record the sound by the recording app.</li>
  </ol>
  
  <p>I tried to find solutions like using "Novocaine" but I still haven't the faintest idea.</p>