Does anyone know what the downward-pointing symbols mean at the end of the fourth line? Or the Xs above the last line?
The V symbols: breath pauses?
X: do I remember rightly that it marks alternative fingerings? (I may be making that up)
b
Hmmm, I thought that breath suggestion marks were noted with a comma looking figure above and between the notes. However, different world notations could be different. No clue on the X’s.
I know in percussion notation and some guitar strumming notation those arrow looking figures represent down stroke and up strokes. But, doesn’t really seem to apply here though does it.
In string notation V over a note indicates bowing direction.
I’ve only seen a V between two notes, as in your example, when it implies a “break” of indeterminate length.
That is used in avant-garde music where even barlines and time signatures may be only implied:

There are two V (break) examples above over the rests.
V