I don’t know if you will read this it’s about 10 years later.
Moll dur is a musical scale different than major or minor.
The easiest way to understand is when you take one major scale like C major for example. The moll dur from C major will be:
C D E F G Ab BC
step No VI(6) is A flat.
You can make any major scale into moll dur (I still don’t know the correct English name) with using a flat on the sixth step.
It could be major-minor tonality but that is from one forum I’ve read somewhere. Again not sure about the correct name.
Hope this helps.