Coil Tapping

[Proxmax]

what coils are active when tapped with the red wire at 5909s?
i've been astonished when i saw a schematic that showed at treb black as hot,
at bass white was hot.
imho this would only make sense to avoid hum in splitted middle position.
i had soldered both blacks as hot and it is ok!!!

any opinions or ideas?

edit:
oh, sorry - i had to add that it was ment with push/pull and toggle.