[RobAnt]

These are essentiall the same device, the only difference being the case design.

Anyway, my question is, does anyone know how to make these devices play MP3 files in track number order?

This is fairly crucial if you have classical or concept albums, in my view.

I know I could change the tracks filenames, adding a few characters at the beginning, but this rather defeats the object of having track numbers embedded into the files anyway.