I think the "html goddess" has been playing tricks on me. She's not really cruel, but she can be d#$%! sarcastic? The last clicky, "MIDIColors," appears to work.
In playing with the program a little, I note that a feature that may be of real interest - and maybe the most useful feature there - is a little click box that lets you change playback speed from 1/10th to 10x, on the fly.
Possibly, this could be a great help for those who just want to listen to a midi (at reduced speed) while they learn a tune. It's certainly easier than editing the program.