keeping track of jit.conway's lives/deaths

hello!

jit.conway's helpfile gives me "dead world detection" [p 1-plane-game]. I'd like to accompany a filling matrix with sound - therefore I'm looking for a way to keep a hold on increasing "liveliness" (respectively its decrement).

check the red toggle in my "modified" helpfile - is there any way to keep track of my living/dead cells? (proportional, shouldn't be exact)

(the idea: the more cells alive, the louder my sound gets (respectively sound dying with less cells actually "participating")

thankful for any hint!
all the best

-jonas