If I upload and ansi what happens in the bases where I have it turned off i.e. most of Fidonet?) Does it just not show, does it convert to just ascii, etc... What about if I use pipe codes?
If you turn off signatures it will not show anyone's signature.
Otherwise, Mystic doesn't do anything special for signatures - it adds them exactly as they are saved.
--- Mystic BBS v1.12 A46 2020/04/21 (Windows/64)
* Origin: Sector 7 (1:129/215)