(grob-property-description 'chord-tremolo boolean? "if set, this beam is a tremolo. TODO: use interface for this!")
(grob-property-description 'chord pair? "?")
(grob-property-description 'begin-of-line-visible boolean? "?")
+
+(grob-property-description 'quant-score number? "Beam quanting score")
+
+(grob-property-description 'least-squares-dy number?
+ "ideal beam slope, without damping.")
+(grob-property-description 'stem-info pair? "caching of stem parameters")