I have X50mix installed and I think that it is running; however, when I go to settings>>Memory>>running programs it isn't there. If it is running, should it be there?
It should show up if it is not minimized to the tray.
If its minimized to the tray, go to the today screen, tap its icon and say "show" and it will be both maximized and reappear in the running programs list.
Try this : plug your headphones and set the headphone boost to max. Exit the prog, play some tunes. Now set the boost to min and exit the prog and play the tune again.
You will hear a huge difference - or at least supposed to..