use attached, update it to make sure it is the latest, load your mkv file, choose to either keep or get rid of dts, tick downmix to stereo, press go......viola......easy.
i used to use headac3 to keep all the channels while converting from dts. i remember it beign a pain to set the prog up with the plugins but easy to use after that.
use attached, update it to make sure it is the latest, load your mkv file, choose to either keep or get rid of dts, tick downmix to stereo, press go......viola......easy.