I was considering lighting the buttons Knievels way (
http://forum.arcadecontrols.com/index.php?topic=30565.0) with two LEDs per button.
I'm not sure if lighting just one of the LEDs in a button at a time would create an interesting effect, but I think that it might. I have 16 buttons and the trackball that I would like illuminated. With this set up, I would definitely need the 32 ports. That would be 14buttonsx2 port controlled LEDs and 2 buttons + the trackball which would have two LEDs each splitting a port (31 ports in use).
Can I just split the outputs with these boards? I'm thinking that I would need to use an external power supply to get this done, but that doesn't sound like a big problem. Or does it?
The RGB buttons do sounds tempting (and expensive). Do they look (almost) as good as Knievel's double LED setup? It sounds like they could be easier to control and have more options. It's so hard to tell what these things look like just from photographs.