On my list of order of music symbols, I don’t have a spot for something like “x-shaped note head.” Where would you put that in relation to other prefix symbols?
Oh that’s a very good question. That has been left off the list. I consider it akin to an ornament. Something that affects the way we play the note or approach the note. So I would put it before a nuance but after a down-bow or mute sign. If there is an ornament as well, I would put the shape sign before the ornament.