This post should be pinned.Typical rule of thumb:
For three-band Fender/Marshall/Vox tonestacks, bass and treble are boost-only and mids are cut-only so flat is 0/10/0
Two-band Baxandall/James stacks are boost/cut for both controls, so flat is 12:00 on both.
SBVT II and Furthermore use a three-band James stack where mids is also boost/cut, so 12:00 is flat there too.
I'm just say'n. I think I've seen this question once or twice before