Intermodulation question -- discrete pickup sources vs. single pickup source

[Jazznoise]

Not to thread necro, but I'm actually using some of this in my thesis. Some quick shots belows of some Intermod distortion. The Octavia is interesting, mine seems to produce more Difference than Sum products.

440hz sine tone played through an Octavia




Some Octavia with a 440Hz and 500Hz tone of equal intensity