Here's what I have:
PS2 V10 w/ Romeo Mod and Matrix Infinity 1.35
Optical Audio out
Dolby Digital 5.1 works great on all DVDs (that have it), however on one dvd, U2 Slane Castle DVD, it will not switch to DTS no matter what I do. I set DTS in the DVD menu, go to play the movie and it's on linear PCM. Press the audio button on the PS2 remote and there's only 2 tracks, PCM and DD5.1. I do believe other DVDs work with DTS. I have a DTS CD that plays fine.
Has anybody else experienced this?