Changing conducting signs

[flup2]

Hello,

I would like to know if somebody knows how conductng signs (
http://lsr.dsi.unimi.it/LSR/Item?id=259
http://lsr.dsi.unimi.it/LSR/Item?id=259 ) are created by Lilypond. 

In a lot of books (Kurt Stone for instance) I noticed that beats divided by
3 are noted by a full triangle, no a "two-parts" triangle like Lilypond
does.

So, perhaps is there a way to tweak these shapes, but I don't know how (and
even where to look for).

Thanks,

Philippe
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