On Mon, Dec 29, 2014 at 6:43 PM, David Nalesnik <david.nales...@gmail.com>
wrote:

> Hi again,
>
> On Mon, Dec 29, 2014 at 6:06 PM, David Nalesnik <david.nales...@gmail.com>
> wrote:
>
>> Hi Jaime,
>>
>> I'll look into lengthening it to reach the stem.
>>
>>
> Not at all easy, I'm afraid.  Are you looking for the cluster-band sort of
> notation, or would individual clusters per stem suffice (like Cowell, for
> example)?  Possibly the latter would be easier to implement.
>

Here's a simple test.  (A rounded box might be preferable.)

 \version "2.19.15"

{
  \hide NoteHead
  \override NoteColumn.stencil =
  #(lambda (grob)
     (let* ((noteheads (ly:grob-object grob 'note-heads))
            (ext-X (ly:relative-group-extent noteheads grob X))
            (ext-Y (ly:relative-group-extent noteheads grob Y)))
     (make-filled-box-stencil ext-X ext-Y)))
  <c'' e''>4. q8~ 4 <c' a'>16 q q q~ q4
}

[See attached image.]

Hope this is helpful--

David
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