(ly:add-interface
'fret-diagram-interface
"A fret diagram"
+
'(align-dir barre-type dot-color dot-radius finger-code fret-count
- label-dir number-type size string-count
- string-fret-finger-combinations thickness))
+label-dir number-type size string-count xo-font-magnification
+mute-string open-string orientation string-fret-finger-combinations
+thickness))
(ly:add-interface
'grace-spacing-interface
'()
)
+(ly:add-interface
+ 'trill-spanner-interface
+ "An accidental for trill pitch"
+ '())
+
(ly:add-interface
'rhythmic-grob-interface
"Any object with a duration. Used to determine which grobs are