The problem I seem to be having is that any time I tried to use the sound wizard and add my files over the one I wanna replace the new files are always too big.
fwiw, be careful if you're getting the 'too big' message. it may or may not be related, but that's how I fried my Diamond board, when I was trying to upload a (small) soundfont, but it kept insisting it was too big.
if you haven't already, backup/save your existing fonts to your computer