[Andrei]

Right! Got it up and running. The site is a smidgen old and I had to do one thing different and that was covered in the forum comments. I have played two tracks so far but I don't have a PCM comparison.
The reason I have finally got round to this is that my redbook flac files are superior via PC and DAC as against a redbook CD played in my Oppo 105. But then SACD on the Oppo 105 trumps redbook flac. (Eyes not glazing over yet? - read on!) So the next thing to try is the DSD via the PC and DAC.
I will download some samples and/or purchase some music in DSD format and make the comparison. I am sure this has all been done before and I recall some debate about the relative merits of each. As I have native DSD playback on a decent DAC I am very hopeful! Thanks again Bill & Randy.