Hi, I just bought a used Hercules Fortissimmo II sound card which has an optical digital output. I am having problems getting things to work. I use PowerDVD for DVD playback and BSPlayer for everything else. The Sound Card control panel has 3 options for SPDIF out. Main output, PowerDVD or Digital Audio Source. If I select Main output, then everything uses the optical cable but only in stereo. If I select PowerDVD, PowerDVD will output 5.1 via SPDIF for DVD material but not for AVI files with AC3 soundtracks (doesn't even give the 'Use SPDIF' output option in PowerDVD). If I use Digital Audio Source, nothing seems to output via the optical output. I am using PowerDVD 5 and have the latest soundcard driver installed. Running Windows XP Pro. Does anyone else have this card and have it working for avi files with AC3 soundtracks (either using BSPlayer or another player). Any help greatly appreciated.