Yes, I know, but what I wanted to say is that you shouldn't take care about the bitrate, since it's adjusted to fit redbook format.
My english is so bad and I miss vocabulary, so I sometimes can't explain things the right way.
Anyway, whatever your original file is, it will always be a CDDA file complying with redbook specs, with always the same format and bitrate and whatever.
Daleandjess : a tutorial is a good idea. I think I'll put all I know somewhere so that it could help people. But I'm far too lazy.
