partcombine problem

[Peter Chubb]

Hi,
        I want to use partcombine to merge in the tune for a song with
its piano accompaniment.  But it's not working the way I expect.

Here's a snippet:

---
\version "2.11.41"
\score{
        \context Staff 
            \partcombine 
                \context Voice=tune \relative c' {s4. s8 b8. d16 }
                \context Voice=accomp \relative c'{ s4.   a8 <b g>8. d16 }
}
---

I see the warning message, `too many clashing notecolumns', and the
augmentation dot on the b is repeated --- as if the \partcombine did
nothing.  In other places in the music (not in this snippet), the
beams are repeated, so a beam of quavers look like semiquavers.

I want the tune in a separate named voice so I can use \lyricsto.
I could put it on a separate stave, but that would make the music
spread over two pages.


Any ideas?

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia