So when you say a bad DSP you are talking about the CS4231A chip, right? Forgive my ignorance here, but I'm not too familiar with all the chips and whatnot on the Rio's mainboard. I have been in contact with Stuart from Eutronix and he seems to think that the CS4231A needs to be replaced.....sorry about all the posts, but I just want to make sure I've got the problem isolated and get my poor Rio working again!