Just thought I'd mention it for clarity's sake. Using the small c in DAc would indicate (at least to me) that the c is tune to the octave above where the C should be. Aeolian in D is tuned DAC with the D, A, and C all in the same octave. DAc would be D, A in the octave lower than the c shown or D*,E,F,G,A*,B,C,d,e,f,g,a,b,c*.The small d is used in DAd because the notes used are in different octaves. D*,E,F,G,A*,B,C,d*Dorian in key of D would be DAG, and is again all in the same octave D*,E,F,G*,A*.For the purest among us, I haven't sharped the F's, and C's as they would be in running the scale of the key of D.It's interesting that DAd and DAD are both used and understood for a 1-5-8 tuning where the D on the melody is an octave higher than the bass. "Confusing and chaos writing tunings can be, young padawan"