letterspacing

[Richard Walker]

Hi all (it's been quiet here!).

Back to (Monotype) Baskerville.  I'm using small caps in my page
headings, and they need a little letterspacing.

I've tried the letterspace package but I fear it only works when you
give it the text itself as an argument (the tokens get gobbled up too
early otherwise), so I can't specify that all page headings should use
it.

So . . . I recalled talk of generating a vpl file with letterspacing.
Lo and behold, fontinst appears to support it.

There are (in v1.504) a number of occurrences where the letterspacing
parameter is set, e.g.
   \setint{letterspacing}{\int{capspacing}}
and
   \setint{letterspacing}{\int{smallcapsspacing}}

but the only place where it seems to be used is in fontinst.sty in the
macro make_header where it occurs in this context:

   \setint{letterspacing}{0}
   \afm_convert\side_bearings=\div{\int{letterspacing}}{2};

So I'm at a loss to see what effect the letterspacing parameter has.

What do I do?!