{define: (( render(content.key) ))
(*- if content.basefret *)
 base-fret ((content.basefret))
(*- endif *)
 frets
(*- for string in content.frets -*)
  (( " " -))
  (*- if string is none -*)
      x
  (*- else -*)
      (( string -))
  (*- endif -*)
(*- endfor -*)
(* if content.fingers *)
 fingers
 (*- for finger in content.fingers -*)
   (( " " -))
   (* if finger is none -*)
     -
   (*- else -*)
     (( finger -))
   (* endif -*)
 (* endfor -*)
(* endif -*)
}
