[CM] Help writing a measure in CMN?

[Bill Schottstaedt]

My original intent was that you'd use a "tied-to" staff for
multiple voices on one (visible) staff -- duke.cmn for example.
But, that's not very convenient when these voices come and
go.  The next fallback would be to use the explicit slur
list makers (slur-, -slur-, and -slur), but I just noticed
there's a bug in them that screws up in the current example --
I'll add it to my list...