Re: Combining voices in American Hymns

[David F.]

On Sep 13, 2016, at 4:14 PM, Rutger Hofman <address@hidden> wrote:

> On 09/13/2016 11:32 PM, David Wright wrote:
>> On Tue 13 Sep 2016 at 21:56:04 (+0100), J Martin Rushton wrote:
>>> On 12/09/16 19:21, Karlin High wrote:
>>>> On 9/7/2016 11:56 PM, David F. wrote:
>>>>> Is there a way to combine two voices and print both stems (up and down) 
>>>>> when the voices share a note?  \partcombine does not appear to do this by 
>>>>> default.
>>>>> 
>>>>> American SATB hymns are typically engraved with the soprano and alto 
>>>>> voices combined and the tenor and bass voices combined.  If a note in the 
>>>>> soprano voice has the same duration as the note in the alto voice, then 
>>>>> the notes for soprano and alto will share a stem.  If the durations are 
>>>>> different, then there is no sharing.  And if the notes are the same 
>>>>> duration and the same pitch, then the note with have both an up stem and 
>>>>> a down stem.
>>>> 
>>>> You're not alone with difficulties on American-style part combining.
>>>> Another LilyPond user shared some of her work with me, and I'm still
>>>> studying the approach she uses. Below is a small example I'm using for
>>>> experiments. I'm not very familiar with the inner workings of LilyPond;
>>>> maybe someone will take one look and say, "That will mostly work, but
>>>> you will run into problems with such-and-such situations."
>>>> --
>>>> Karlin High
>>>> Missouri, USA
>>> <snip>
> 
> My guess is that \partcombine #'(1 . 9) or \partcombine #'(2 . 9) does what 
> you specify. I attach code for default partcombine and both your options. 
> Beware that stem crossings need to lead to uncombined notes.

Why 9 as the second argument to \partcombine?

David