Capo positions, tunings, chords and other wonderful things
General mountain dulcimer or music discussions
Dana, instead of trying to read and understand, just play and feel. Play a simple song on your dulcimer. Then put the capo at the third fret and try to play it again. It will work, but you will be in a higher register. Then, perhaps put the capo at the first fret and try again. It won't work.
In the same way that you need different fingering when you switch tunings, you need different fingerings when you use a capo, with the (partial) exceptions of the third and fourth frets.
Sometimes this stuff makes more sense when you play and get a feel for it rather than try to understand it first. And even if you decide you don't like playing with a capo, you should still have a feel for how it works.
Why would you want to know this?
reason 1: Dulcimer players almost always play in D, but other folk musicians often play in C, G, and A as well. If you are in a multi-instrument jam, you will want to know how to play in those keys as well. What if you're in a playing circle and someone calls out "Angelina Baker" in the key of G. You could try to figure it out in your regular tuning, you could retune to DGD and try to figure it out there, or you could slap on the capo at the third fret and play the song exactly the way you played it before, but you will now be in the key of G, just like everyone else.
reason 2: Do you sing? Despite what some people say about certain keys rather than others working for their voices, it is the tonal range of the melody that determines whether a tune fits your voice. I can sing some songs in D. Other's I can't for the life of me. But if a song doesn't work for my voice in D, it probably will in G or A. Truth be told, I have a baritone dulcimer that I tune to G or A, but if I'm not home and want to sing one of those songs, I just put the capo on 3 for G or 4 for A and I can sing the song. Again, the fingering for the chords is the same that I would have used in D, but the capo puts me in a different key. If I get a chance I'll put a video together to demonstrate this.
A while back I wrote this piece that I've attached called "Strumming in Various Keys out of a DAd Tuning." I'm sure it was in response to a question here or one posed by my local dulcimer group, but I can't remember. Maybe you'll find it helpful.