@Debi, you should know, first of all, that 26.5 is not considered a "longer" scale length. I would say "longer" would only apply when you get to 28". Second, your fingers will stretch. That 1-2-4 A chord might be a challenge at first to play on a 26.5" scale length, but you will be able to do it, and over time your fingers will stretch and strengthen and it will get easier. Third, there are always workarounds for chording if you really can't reach a chord. Instead of 1-2-4, you could play 1-0-4 or 4-4-4, assuming you need that 4th fret on the melody string for the melody. If you are only strumming chords, then 1-0-1 will work as well, or 4-4-6+.
I only use the 1-2-4 chord as an example because it is the hardest stretch of all the "normal" chords on a dulcimer tuned 1-5-8 such as DAd. But the same principle applies to other chords and chord shapes as well. There are always alternatives.
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Dusty T., Northern California
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As a musician, you have to keep one foot back in the past and one foot forward into the future.
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