all kinds of stuff: Milt Gray on cartoon timing past and present

all kinds of stuff: Milt Gray on cartoon timing past and present:
"Instead of simply cutting from one scene to the next, Bob would
sometimes move the characters and the props around, at the same time
as doing an iris wipe from one scene to the next, all with a very
specific rhythm, sometimes to suggest increasing tension in the
plot. Bob told me that on occasion, when he had a specific
syncopated rhythm in mind that didn't adhere strictly to a regular
beat, he would run blank film through a movieola at full (normal)
film speed, and tap on the film with a grease pencil the syncopated
rhythm he had in mind, and then take the film off the movieola and
count the frames between the marks. He would time his actions to
those numbers of frames, and then give that information to Carl
Stalling, who would compose music to fit that timing. I should have
asked Bob which films he did that in, but I didn't so I can only
guess, but a very likely candidate is the scene in Wagon Heels, about
5 minutes and 15 seconds into the cartoon:

Injun Joe has just fired (out of his mouth) a giant gun shell at the
circled wagon train, which blows everything off the screen (including
distant mountains). Then, in rapid succession, the wagon train's
wheels fall down to the ground, then the wagon train itself, then a
large foreground cactus, then the distant mountains, then there is a
quick iris wipe to the next scene (which is almost just empty
ground), then a white settler zips into scene, then Injun Joe zips
into scene to confront the settler, all in the space of about five
seconds. This is just a 'quick transition' from one scene to the
next, but the timing and sense of energy is thrilling."