I don't know, I must be missing something but I can't get DPL IIx to kick in for 5.1 Audio Sources. With 2.0 audio source, I can toggle through: - Prologic Surround Standard - Prologic Surround Enhanced - Prologic IIx Movie - Prologic IIx Music - Prologic IIx Game - DTS Neo: 6 Cinema - DTS Neo: 6 Music With 5.1 audio source, I can toggle through: - Dolby Digital Surround Standard - Dolby Digital Surround Enhanced The toggeling is done with the same Dolby/DTS-button on the remote. The audio is from the same DVD, Aliens, with one 2.0 track and one 5.1 track. Optical is only transport. Am I just lost in the Dolby-jungle or have Yamaha missed something in their firmware upgrade?? I thought the whole idea with IIx was "processes native stereo and 5.1-channel content to produce 6.1 or 7.1 output channels." Note: SB speakers connected and configured with YPAO.