Just checked my 4 1GB DaneElec SD Cards, which I bought about a year ago and they work fine with MP3 files. I don't use my cards for MP3 files but in view of Alec's comments, I thought I would just try them out
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)