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Re: Limitation with beat grouping

From: Trevor Daniels
Subject: Re: Limitation with beat grouping
Date: Tue, 24 Mar 2009 08:27:27 -0000

Patrick McCarty Monday, March 23, 2009 11:07 PM

On Mon, Mar 23, 2009 at 2:58 PM, Cameron Horsburgh <address@hidden> wrote:

I've also just noticed another thing: the figure

a8 a16 a16 a8 a16 a6

is rendered

a8[ a16 a16] a8[ a16 a6]

which is my preferred option. In fact, I would prefer everything to be
broken to one beat groups *except* for the special case of four
quavers which can appear as one group. It might be easier to write a rule for that and manually beam the four quaver figure which is far
less common in my score.

I agree.  This example highlights the issue very clearly:

\relative c'' {
 a16 a a8 a a
 a8 a16 a a8 a
 a8 a a16 a a8
 a8 a a a16 a  % beaming is different

I agree this behaviour is inconsistent, although it has been this
way for all the 2.12, 2.11 and 2.10 releases and probably several
earlier ones too.

The autobeaming rules have been substantially modified for
2.13 (probably 2.13.1, although the version naming in 2.13
is unclear at the moment).  In 4/4 time I've decided to go with
a 4-beat pattern by default, so this particular inconsistency
has been corrected.  The main reason for changing the rules
is to permit beatLength and beatGouping to be used in more
cases.  For example, to change the default unit in 4/4 time from
quarter note to half note (so four 8th notes are beamed together)
all you will need to do is set beatLength to 1/2.

(It still will not be possible to automatically beam
a8[ a a a] and a8[ a] a[ a16 a] simultaneously, though.  That
is a basic limitation of the autobeaming method, not the rules.)


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