· The Reed Pen · — alphabetvm arabicvm, XXVIII litterae
tap a word — the letters answer in order, then the word is spoken
tap a letter to hear its name and its note — alif to yāʾ, right to left
vox arabica deest in hoc instrvmento — the letters keep their notes only
tap a slot, then a letter — press volvere; the wheel plays notes only