I may be confused about traditional sounding dulcimers
General mountain dulcimer or music discussions
I've been playing Noter & Drone for some 40 years. I don't know who you've been talking to or where they got their information but what they seem to have been saying is completely at odds with all other knowledge about Modes and tunings that I've ever encountered -- and I read a LOT!!
You can play N&D in ANY, repeat ANY, tuning and it is a "traditional" way to play. You can play Fingerdance style in ANY tuning at it is also a "traditional" way to play. Playing Chord-Melody style is not "traditional" it is a late 20th century (post 1950) invention.
DAA and other 1-5-5 tunings have ALWAYS been called Ionian Modal Tunings (well at least since the 1500s)
DAd and other 1-5-8 tunings have ALWAYS been called Mixolydian Modal Tunings (same disclaimer)
Both Ionian and Mixolydian are MAJOR scales, not minor scales. However the Mixolydian scale's 7th note (the solfege note we call "ti") is flattened from what that note would normally be (if that 7th note is supposed to be F# for example, it becomes an F). This is what happens if you tune to DAd, for example, and play the Mixolydian scale -- which begins at the Open fret -- and have no 6+ fret on your dulcimer. VERY few melodies which Europo-Americans have created in the last thousand years use a scale where the 7th note of that scale is flatted from its natural note. A huge number of dulcimer tunes which are tabbed in DAd are not, in fact, Mixolydian/DAd tunes -- they do not have that 'flatted 7th note in them.
Players from the late 1800s through the 1960s often (but not always) tuned "Octave" or what we now call Galax tunings, NOT Ionian or Mixolydian tunings. Octave tunings are things like Ddd or Ccc, Galax tunings are usually ddd or ccc.
"Traditional dulcimer sound" comes not from the tuning, but from the shallow/narrow bodies of 'traditional' dulcimers which have much less interior volume that a conventional modern dulcimer. Modern dulcimers with a 27" VSL are roughly 2.25" deep x 7-8" wide x 31" long (minus the head); a traditional dulcimer with the same VSL is roughly 1.25" deep, 6-7" wide and 28" long. When tuned to the same tuning, the lesser volume traditional instrument tends to give a more "high silvery" sound; where the modern dulcimer tends to produce a deeper more "mellow", sound.
updated by @ken-hulme: 02/14/18 02:23:35PM