Kinda sounds like I'm playing a warped record (for those of you that remember what records were). It used to be called warble. It's not really bad and I'm sure to some, they wouldn't even notice it, but to me, it's bad enough to be annoying for it just doesn't sound quite right. Is it the compression artifacts that I'm hearing and if it is, how do I get rid of it. I'm using ACC at 224kbps. Any suggestions or could it be a bad drive in the iMac?