XeTeX and precise font sizes

[Neiaglov Dmitry <dima@getalime.ru>]

Hello there!

I was googling around, but couldn't really figure out how to use  
OpenType fonts with ConTeXt and XeTeX with precise sizes in points. I  
am trying to create a subsection style with Gentium 24pt.

I am creating a typeface like it's recommended in the documentation:

\definetypeface			[Gentium][rm][Xserif][Gentium]

Then I create my own subsection style:

\setuphead				[subsection]
						[alternative=inmargin,
						numbercolor=orange,
						style=\Gentium]

So far so good, but it actually types the subsection out with some pre- 
determined font size.

What I'm trying to do is get my subsections at the size of, say,  
precisely 24 pt.

Stuff like

\definetypeface			[Gentium][rm][Xserif][Gentium]
\definefont				[Subs][Gentium at 24pt]

apparently invokes non-XeTeX font routines (pardon my ignorance):

kpathsea: Running mktextfm subsections
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1;  
nonstopmode; input subsections
This is METAFONT, Version 2.71828 (Web2C 7.5.6)
kpathsea: Running mktexmf subsections
! I can't find file `subsections'.

The best I was able to get was adding rscale

\definetypeface			[Gentium][rm][Xserif][Gentium][rscale=1.4]

which is bad for two reasons: first, it's not logically correct, since  
I am planning to use my typeface for different sizes throughout the  
document, and second, I really want to control my sizes in points.

Thanks in advance,
Dima
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