I see there's meant to be source code available but it's under CVS so I can't just browse it to have a look. From a look at other parts of their site, there's mention of Winamp plug-ins but I can't tell if you have to install them or if the base install (I've not downloaded anything so far) should "just work".
So does it install a plug-in into Winamp (which might be why it's not seen by WACUP if it's gone into a different install folder or you've installed WACUP in portable mode which will prevent 3rd party plug-ins from being loaded). It might also be looking for a specific window title string which I've tried to match to Winamp within reason so that could be why it's failing to find things.
Also is there anything else specific about installing it that I need to be aware off ?
-dro