> Did the SWI-X installation work ?

Well, I did get the SWI-X to work with the Sony, but it was a bit intermittent, probably due to the LED not being easily/cleanly mountable real close to the head unit. So I got a stronger LED with intentions of trying it out, but then I started remodeling the house and having twin boys, and I haven't gotten back to the car stereo project yet. :-)

I was never able to get the SWI-X to be able to control both the Empeg and Sony HU, but I'll give that another run when I can, and I'll update with the results.

When the SWI-X did work it was pretty cool, and I have no doubt that if I didn't mind having it more obvious or my car allowed a closer mounting for the LED it would have worked more reliably. It was pretty easy to install and configure, so I'd recommend it as a product.