Is this just me being thick? Bought a DV88+ last week and am very happy with it except for one thing... I have some CDs where I've encoded regular 2 channel tracks into an ambient DTS mix. The CDs played fine in surround on my old Pioneer but on the Arcam - nothing. The discs play ok but there's simply no sound. Audio output is set to Bitstream and the player is using a coax connection to the amp. Any ideas?