proportional grace notes

[V!ctor address@hidden]

Hi,

I would like to have grace notes spaced proportionally to their
durations, like this:
http://music.columbia.edu/~vadan/lilypond/proportional_gracenotesB.pdf

I thought that using proportionalNotationDuration would do it, but it
only affects the "real" notes. Here's what I get:
http://music.columbia.edu/~vadan/lilypond/proportional_gracenotes.pdf
with the following code:

%
*********************************************************************************
\version "2.9.7"
\include "english.ly"

\layout{
        \context{ \Score        
                % proportional notation ------------------
                proportionalNotationDuration = #(ly:make-moment 1 32)
                \override SpacingSpanner #'strict-note-spacing = ##t
                \override SpacingSpanner #'uniform-stretching = ##t
        }
}

% THIS ...
\new Voice{\afterGrace c''2. { c''32 c''8 c''32 c''16} c''4 c''2 c''2}
% OR ...
\new Voice{ c''2. \grace{ c''32 c''8 c''32 c''16} c''4 c''2 c''2}
%
*********************************************************************************

>From looking at 6.5.7 in the manual (2.9), I can see it should be
possible, maybe somehow changing the 'grace note timing', but I can't
figure out how. 
How could I do this? Is there an easier way?


Thanks,

Victor.

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