Yikes - quantum physics!
You got that right!***
Good question. I don't know a lot about it. I have heard that some light weight t-shirts need lower density or you are basically punching out a hole in the shirt.
ttt as I can't help
yes good question thats why i miss my wilcom it set the density fror the fabric i choose i have not learned if embird does or not
Good question. My software does not have settings according to fabric either. So it's a matter of trying. I digitized a number of squares, same filling, different settings and try it out on fabric scraps.