This is a file to set up your machine.
When you are adjusting your machine, you often do it with a satin stitch and an alphabet is very suitable for that. But I often notice that when I have it set up perfectly, with other stitch styles, my machine is not yet perfect.
I've made a pattern that contains common stitches and is handy to test with, not too big with just good enough.
I have this file saved on my machine and on stick so I always have it close by. Very handy.
I'm sharing these with you for free, because embroidery starts with a well-tuned machine.