Convert Midi To Smf0, How do I convert a .mid file to an SFO Options

[treydot]

I've downloaded some Midi files (.mid) and loaded them on a smart media card to load into a Casio px-400R. I get and error message saying these files are not in SMF0 format (standard midi format 0). The Casio came with conversion software that converts midi files to smf format, but it only runs on windows machines. How do I convert midi files to smf on my Mac?

Thanks