When I first joined my college glee club, I signed up to be a second alto, because I felt most comfortable there.
Later when I got a voice teacher, she switched me to first soprano, because my high notes were louder than my low notes. Since, then, whenever I have had voice lessons, teachers have worked on my mid range or my high range, but never my low range.
YET, when I look at casting notices, they are always asking for an alto belt. Now I've finally figured out, I think, how to do a low belt.
Here's an attempt https://chirb.it/4s61nz
Still working on that high belt. Here I'm switching to legit when I get to about g4.