Audio output on headset & speakerphone simultaneously
<p>I'm trying to create a dual screen setup. The Android tablet (Nexus 10) is connected to another screen using HDMI.</p>

<p>When playing movies on the tablet (using VLC or other Apps), it will be displayed on both screens properly. <br />
However, the Audio signal is only transferred via HDMI. Using the <a href="https://play.google.com/store/apps/details?id=com.woodslink.android.wiredheadphoneroutingfix" rel="nofollow">SOUNDAbout App</a> we managed to have the Audio output on <em>either</em> headset or HDMI.</p>

<p>I cannot see a function to set the audio output for both devices at the same time.
I tried setting it up with the Audio Manager, but it only works for one channel.</p>

<pre><code>AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setSpeakerphoneOn(true);
am.setWiredHeadsetOn(true);
</code></pre>

<p>Another thing I noticed is the setParameters API which then passes variables to the platforms Audio system. That might be ALSA, perhaps the solution is there?</p>
