I just added a feature an user request. He wanted to see the last numbers called when calling the numbers. So I added the possibility to see from 1 to 10 last numbers called, you can also configure the color and opacity of the numbers and the color of the strip where the numbers are shown.
While I was working, I decided to add also the possibility to select the color of the number in the ball. And also fixed some usability issues. I'm still testing it, but probably this weekend when I have some free time, I'll release this version. Here you have some screenshots so you can see what I'm talking about.