Folkfan, your example of Brother John may be EXACTLY where I need to start. Really, I'm pretty happy with DAA, might should leave well enough alone. Sure appreciate the help from you folks.
The Dulcimer. If you want to preserve it, jam it!
If you've got your instrument now tuned in DAd, then the tunes you played in DAA can be played by subtracting 3. If I play Brother John (in DAA) as 3453, 3453, 567, 567, 787653, 787653, 303, 303. In DAd it's 0120, 0120, 234, 234, 454320 454320, 0 0middle 0, 0 0middle 0. The one advantage to staying in DAA for noter/drone or melody/drone style is that you have notes below the starting note of the scale (3) to play on the melody string, but in DAd you have to hop over to the middle string for the lower notes as in the ding, dong, ding in Brother John. I find hopping over to the middle string awkward. If DAd strikes the right note with you, though, then play on. Oh, and one more item, the 9th fret note in DAA becomes the 6+ in DAd.
Love DAC, just don't know that many simple tunes to strum out. A lot of tunes in DAA start out on the first or third fret ... where do I commence in DAd ... heh, heh ... never thought of that did ya :)
Oh, an' I have one of them little bitty Mac's tuned at CGGG (ggg?) ... talk about wound tight!
... well ... maybe a little. Finally getting up enough nerve to try DAd ... so, which d? One octave above the D? I have Snark tuners.
Any tips on making the transition from DAA? I thump stuff out noter/drone. Should I leave well enough alone? I have more than one dulcimer and am mostly just interested in trying that tuning.