Image courtesy of Steve Plaskin, AudioStream.
Creative systems are great and that is why the Codex has both USB and Optical inputs. Unfortunately, not all devices with optical outputs conform to the S/PDIF standard. The Codex does comply with the standard so in certain cases non-conforming players will not work well with the Codex. If you have this problem contact us. We have alternate firmware for the Codex which should solve this issue.
In the mean time, enjoy the music!