I have seen a lot of posts about burned CDs not working in the MACH 460 factory sound system. One way, for whatever reason, that works is to create a CD, and then make an exact copy of the CD. The copy works perfectly fine, while the orignal skips and sometimes says "BAD CD". Like I said, I don't know why, and I have used 2X the CDs, but it works on mine. I noticed it when I made a copy of one of my buddy's burned CDs.