This is a guess, but check out the two pertinent sections of this STK tutorial. In as much as Ge was a student of Perry, my guess is that this is an STK thing or related to a similar issue.

Do you meant this?
https://ccrma.stanford.edu/software/stk/tutorial.html

It's not clear to me why or when we would ever use "blocking", based on this, but I do think you are right that this must be what is referred to.

Thanks.
Kas.