I have a Sony cd walkman DNE710 (manuf. around 2003) which shows mp3 tags, but after editing the tags, I only see dashes on it. I have a newer walkman which shows the edited tags without problem. Any ideas how I can edit and make the tags still compatible? The Sony manual doesn't seem to specify tag requirements. The software I used was Tagscanner, Mp3tag, and Audioshell for Windows.