Hey thank you!
And hmm good question... to be honest it was a while ago and now that looks quite confusing indeed 
Looks like I was playing with Euclidean rhythms though.
I guess the syntax have changed now (making it easier).
You should be able to rewrite the original code
d1 $ s (e "<3 7 5 2>" 8 "superchip")
with
d1 $ s "superchip(<3 7 5 2>, 8)"
There's a video about Euclidean rhythms here
I hope it helps!