How has it been this long and you still haven't fixed your horrible audio problems on an app? Clash of Clans has better audio options than you. I will spell it out for you one more time:
1 Let me play audio from another source while still being able to hear game audio
2 Let me play the audio from my phone or iPad, to smart speakers.

It isn't brain surgery. I have no earthly idea why you have restricted these features from your app in the first place, I can only imagine what kinda dumb old man at your corporate board meetings thought this was a good idea. FIX IT NOW!