I know that when you have one stave with S/A or T/B combined you have the convention that the sopranos (or tenors) always have tails up, and altos (or bases) have tails down.
However, when it comes to 8-part harmony compressed into 4 staves, does that convention still apply?
I mean, would Sop 1 be tails up, and Sop 2 be tails down (and the same for Alto 1 / Alto 2, Tenor 1 / Tenor 2 etc), or is the split usually done purely on note pitch (the "ones" always get the higher pitched note) regardless of the tail direction?
First note: is the Bb or the Eb part 1?
Also, for bar 3, is it safe to assume that the pitch defines the part, since there are no other clues to go on?