I was trying to understand the damping practices of D02 and D03, hoping to learn general criteria and apply to any (or many) other pieces.
Most of the damping seems to be trying to cope with undesirable 4th intervals but, in D02 ex.4 2nd compass you have a damp to cope a minor 3rd (C# - E), in D02 ex.5 2nd compass you have a damp to cope with a 5th and a 2nd (arbitrary to me). In D03 ex.5 4th compass you damp a 2nd and a 3rd minor interval.
Thus look to what in a piece to determine dampings ? As far as i understand you damp string to rule out dissonances that may undermine polyphonie.