Probably ignorant question re. Commodore Monitors

Hi! I finally got a Commodore monitore for one of my C64's - most people seem to be charging around $90 for them, and that seemsed far too much. But I picked up one with two C64's and a couple of disk drives for $30. Anyway, the point is that I was wondering if I can use some of my other stuff on it, most notably the Amiga CD-32 and the 3DO. Sorry, but I don't know the model of the monitor. :( (It is a monotone one, though, and it is two tones of gray - a darker gray on the front, and the back section is a lighter shade). The problem is that it has two video inputs, one for the picture and one for the chroma. Is it possible to take a normal signal and split it accordingly, or should I just look for a more standard colour monitor? Thanks heaps, Adam.