This model is based on the Cantigas de Santa María manuscrit, XIII century. Made of lenga, ever­green beech or maple wood, combined with cypress or german pine. Two G-D drones and two chanterelles in G, with a one octave and a half  extension in two versions: Diatonic, with a possible modification of tangents in order to vary the tuning. Chromatic, (ditto, plus the modern addition of semitones keyboard).