(xo-list (cdr (assoc 'xo-list parameters)))
(fret-range (cdr (assoc 'fret-range parameters)))
(barre-list (cdr (assoc 'barre-list parameters)))
(xo-list (cdr (assoc 'xo-list parameters)))
(fret-range (cdr (assoc 'fret-range parameters)))
(barre-list (cdr (assoc 'barre-list parameters)))