Setting the background on a Track Matte level - How?

Here is the (very) simple process.

1. This added to V1 level, Drag a short clip to make a sequence.
2. Use the Type tool to add text, e.g. TESTING, this creates on V2 level, with a black background
3. Find Track Matte effect, drag onto V1 Video, then in effects select V2 (Text layer)

The text appears on top of the video, but the video is now visible through the lettering, depending upon the letter font size. This is what I want, BUT, the text background colour is BLACK.

Can this be changed?

I’ve done this effect in other ways, but it involves more colour layers, I was hoping to change the degault black, rather than having to use several colour layers.

Thanks in advance.