DTS Audio with Serenity
I know several people like to have DTS audio. Also several are using MX Player as an external player. MX Player by default does not have DTS audio enabled due to licensing restrictions by the makers of DTS. But if you have MX Player 1.7.19, you can now enable DTS audio support by installing a custom codec. Follow the instructions at the XDA developers forum to get this to work.
Hope this helps some out.
Update: Dolby Digital has been removed from MX Player and is now in the custom code.