I was not under the impression that the H2 played .wma files at all... (it certainly is not mentioned n the manual)

Perhaps just it's presence is doing the poor H2 in?

Also, check the sampling rate of the mp3. Anything other than 44.1 or 48k is not going to get played.

Pages 86 and 87 of the manual is pretty specific in detailing what can be played.

What settings are your .MP3 encoder set to?
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An arranger is just a tool. What matters is what you build with it..!