I have been trying to record the sound from some HDDVDs onto MiniDisc but all I getting is clicking. I've tried just recording the TV and this works. I believe this may be down to Dolby Digital as it only appears to work when I select channels (on Sky) that are not in DD. The Minidisc recorder is an old portable unit. Any ideas on how to solve this. The AV Amp I have is a Yamaha DSP AX640.