you may find help at dizzi.co.uk, she has a lot of interesting vids on her web site one being how to tune a dulcimer, also if you do a searce for songbird dulcimer, he has a great vid as well taking you through the process.
a dulcimer is an Appalachian instrument that you play on your lap it is like a guitar but you simply lay it across your lap, push down the first string (melody string) on a fret and strum all three...