Vertical offset of wedges

I hate to be a stuck record, but we need projects rather than pictures to be able to diagnose these kinds of issues (a reminder).

These properties are offsets rather an absolute values, so zero is the calculated position rather than the middle of the staff or whatever. This is helpful because it means that if you e.g. change the pitches of the notes such that the hairpin needs to move, the offsets can be applied relative to the new calculated position.