+
+ (fret-diagram-details ,list? "An alist of detailed grob properties
+for fret diagrams. Each alist entry consists of a
+(@code{property} . @code{value}) pair.
+The properties which can be included in fret-diagram-details
+include the following:
+@itemize @bullet
+@item
+@code{barre-type} -- Type of barre indication used.
+Choices include @code{curved}, @code{straight}, and
+@code{none}. Default @code{curved}.
+@item
+@code{dot-color} -- Color of dots. Options include
+@code{black} and @code{white}. Default @code{black}.
+@item
+@code{dot-label-font-mag} -- Magnification for font used to
+label fret dots. Default value 1.
+@item
+@code{dot-radius} -- Radius of dots, in terms of fret spaces.
+Default value 0.425 for labeled dots, 0.25 for unlabeled dots.
+@item
+@code{finger-code} -- Code for the type of fingering indication used.
+Options include @code{none}, @code{in-dot}, and
+@code{below-string}. Default @code{none} for markup fret diagrams,
+@code{below-string} for @code{FretBoards} fret diagrams.
+@item
+@code{fret-count} -- The number of frets. Default 4.
+@item
+@code{fret-label-font-mag} -- The magnification of the font used to label
+the lowest fret number. Default 0.5
+@item
+@code{fret-label-vertical-offset} -- The vertical offset of the fret label
+from the fret. Default -0.2
+@item
+@code{label-dir} -- Side to which the fret label is attached.
+@code{-1}, @code{#LEFT}, or @code{#DOWN} for left or down;
+@code{1}, @code{#RIGHT}, or @code{#UP} for right or up.
+Default @code{#RIGHT}.
+@item
+@code{mute-string} -- Character string to be used to indicate muted
+string. Default \"x\".
+@item
+@code{number-type} -- Type of numbers to use in fret label. Choices
+include @code{roman-lower}, @code{roman-upper}, and @code{arabic}. Default
+@code{roman-lower}.
+@item
+@code{open-string} -- Character string to be used to indicate open
+string. Default \"o\".
+@item
+@code{orientation} -- Orientation of fret-diagram. Options include
+@code{normal} and @code{landscape}. Default @code{normal}.
+@item
+@code{string-count} -- The number of strings. Default 6.
+@item
+@code{string-label-font-mag} -- The magnification of the font used to label
+fingerings at the string, rather than in the dot. Default value 0.6.
+@item
+@code{top-fret-thickness} -- The thickness of the top fret line, as a multiple
+of the standard thickness. Default value 3.
+@item
+@code{xo-font-magnification} -- Magnification used for mute and
+open string indicators. Default value 0.5.
+@item
+@code{xo-padding} -- Padding for open and mute indicators from top fret.
+Default value 0.25.
+@end itemize") ;"
+
+
+ ;; ugh: double, change.
+ (full-length-padding ,number? "How much padding to use at the right side of a full-length tuplet bracket.")
+ (full-length-to-extent ,boolean? "Run to the extent of the column for a full-length tuplet bracket.")
+