How do I set the depth when using a V tool?

I am using VCarve to engrave names. It is a 90 degree bit but I want to vary the depth of the engraving on the letters for example the first letter deeper than the rest. I can create it as separate vectors and layers but don’t know how to control the depth of cut when engraving using vcarve. Hope that makes sense!

Thanks. This allows me to increase the size of each letter. I also found this which is a useful explanation