Sense and Uni - Having a nightmare

So as part of our first section of uni we have to use Scratch, or the Open Uni version called sense and its an absolute nightmare, it may just be me, but I really struggle in this, I can program python easy but I find sense harder, maybe because I cant imagine the source code working in the same was I can with python.

So I am looking for some help with a question, we have to make a drawing, so when you press the flag it start drawing, half way down it changes pen size based on sound level.
I have got the main part working, were the image begins on the stage but its just a big blob that flickers.
What could I do to make it do a line and then continue onwards.

What should I change?

Thanks