Gregory says: The Unitar Strummer has a diatonic fret pattern like a stick dulcimer, and only one string. I stamp numbers next to the frets as part of a simple "play by number" system using dulcimer tabs found online. I build these using recycled or reclaimed locally available hardwoods. The one pictured is reclaimed Florida Bald Cypress with a cherry wood fingerboard. The fret wire is nickle mandolin frets from Steward MacDonald. It uses any gauge ball end guitar string, just tune it to the appropriate key.