code: private boolean unmute() {
      isMuted = false;
      setSoundChipText(getContext().getString(R.string.unmuted));
      showSoundChip();
      soundFabOn();
      return isMuted;
    }
docs: Sets up unmuted UI event.
  <p>
  Shows chip with "Unmuted" text.
  Changes sound {@link FloatingActionButton}
  {@link android.graphics.drawable.Drawable} to denote sound is on.
  <p>
  Sets private state variable to false (unmuted)
  
  @return false, view is in unmuted state