Peter T., you never confirmed or denied whether abc notation was useful to you.

Just in case it is, here is a dorian air in abc notation:

X:1
T:En ce premier jour de Mai--Source: Bib Nat. fr. 9346, 15th century
M:2/2
Q:1/2=60
K:C
D4A4 | G4c4 | c2(BA)B4 | A8 | G6G2 | F4A4 | A2G3(FED)| E4D4 :|
D4F4 | E4G4 | G6F2 | E4D4 | D4A4 | A4A4 | G4F4 | E8 | D4A4 | G4c4 | c6c2 |
B4A4 | z2 A2G4 | F4E4 | D2G4F2 | E4D4 ||

T.