QUOTE(WonderSlug @ Jul 14 2008, 18:00)

MPC is only "indistinguishable" from the original CD in terms of what you hear. If you decode the MPC back to a WAV file, you'll find it different from the original WAV file (or CD track) from which it was encoded.
Just so there is no confusion, it makes no difference whether you listen to an MPC, or decode it first to WAV and listen to that. Either way what you hear is identical, because when you listen to an MPC it is first being decoded to PCM to play it. It just is not saved as a separate file.
I believe what WonderSlug was trying to say is that the decoded WAV file is not identical to the original WAV file, even if there is no audible difference between them, so it makes a difference when you reencode to MP3.