Re: Trying to figure out a beat grouping

[Trevor Daniels]

Cameron Horsburgh wrote Thursday, March 19, 2009 10:28 AM
> I'm having trouble trying to modify the automatic beaming for a 
> piece
> I'm working on. This piece has many examples of this figure in 4/4 
> time:
>
> a8 a a a16 a
>
> I would like the beaming to be:
>
> a8[ a] a[ a16 a]
>
>  ___     _______
> |   |   |   |___|
> |   |   |   |   |
> |   |   |   |   |
> O   O   O   O   O
>
>
> but the default is
>
> a8[ a a a16 a]
>
>  _______________
> |   |   |   |___|
> |   |   |   |   |
> |   |   |   |   |
> O   O   O   O   O
>
>
> I can't figure out how to get my desired beaming. How do I tell 
> the
> beam engraver to look for semiquavers at the end of beat two to 
> decide
> whether or not to put a beam between between beats one and two?

I can't see any way of achieving this using the
beam-ending rules, I'm afraid.

> If the semiquavers came at the end of beat one it probably 
> wouldn't
> be that hard.

Yes - that's easy.

> Is this the sort of thing the 'begin' beam-limit type
> was intended for?

Even this wouldn't help.  You need some sort of
back-tracking so that when the 16th notes were
found the beaming was restarted using a different
set of rules.

A music function could be written to take 5 pitches
and apply the durations and manual beaming to them.

Trevor