Chroma Key question

I've been using Vegas Pro Movie Studio Platinum for doing some basic animation and found it to be really easy. I have an older version of the software which limits how many chroma key layers that I can stack up. Does anyone know if with the newer and more pro versions of the software, if you can have many layers of chroma key'd video tracks?

To give some understanding, each of my video layers is simply an animated silhouette with a green screen background, that are all going to get composted together.

Hey Mike, thanks for your response.
With the pro version can I assume that the unlimited tracks also is boundless for how many layers can have chroma key?