Ok, this is how you do it, I just made an account so I can tell you guys how.

I've done this before so I know it works, I've got a Pioneer CLD-D606 with an Optical AC-3 audio output.

You buy yourself a MiniDisc player with a 3.5mm Optical input (You will need an adapter to go from Optical SP-DIF to 3.5mm Optical input Plug that into your MiniDisc player and load the Minidisc up with a 1GB MD disc, then setup your Minidisc player to save in WAV format.Rinse and repeat until the 1GB Minidisc is full, then copy the uncompressed PCM .WAV file off of the MiniDisc player onto your PC and edit it and sync it up to your bluray rip copy.

I have apsolutley no idea if it will work with DTS 5.1 audio, all I know is that once I loaded up a Dolby Digital copy of Terminator 2 on LD and got audio recording directly to my MD recorder in WAV. which is Stereo.

It sounded freakin great through the headphones too by the way. which were plugged into the MD player's audio output.</p></p>