#### arpeggio-interface

Functions and settings for drawing an arpeggio symbol (a wavy line left to noteheads.

##### User settable properties:

`arpeggio-direction` (direction)
  If set, put an arrow on the arpeggio squiggly line.

##### Internal properties:

`stems` (list of grobs)
  list of stem objects, corresponding to the notes that the arpeggio has to be before.

This grob interface is used in the following graphical objects: Arpeggio

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