I'm looking into this too, and let me tell you: you're getting into a big can of worms. You have 2 options to control WinAmp from your head unit. The first option is just hope somebody sells a kit to hook them together for you, and hope that you find them, and then hope that you can get the WinAmp plugin to work right. The other option (the way that I'm going to do it) is to get a hold of the pinout/port protocol for your head unit (btw: anyone have this for an '04 Civic?

) and interface it by yourself. If you choose option 2 be careful that you know what you're doing of you can fry your HU or your mobo in half a second.
I don't think that the changer returns any information to the head unit about anything but track / disc number. I'll probably hook up a 20x2 character LCD to scroll the information if this actually is the case.
Like I said though, once I find anything out or if I manage to write that WinAmp plugin, I'll create a thread and show the world what's up. This is just about all that I know for now, but if you want to talk about the project more, shoot me an email @
k.j.powers@gmail.com 