I recently bought an Onkyo HTS660 for some relatives who will be using a PS2 as the DVD player, but I'm having trouble figuring out how to setup the PS2 so that it passes to DTS signal to the receiver. I looked in the manual, and went into the audio setup to turn the optical output on, and the dolby digital output on, but I can't get the DTS output option to light up so that I can select it and change it from off to on. I tried entering the menu using while playing different DVDs, but have had no luck so far. (I even used a DVD with DTS - Pirates of the Caribbean.) Am I missing something here?