[Fontconfig] How to display bold fonts less bold?

[Charles A. Landemaine]

I'd like to display bold fonts less bold because they look too dirty
and hard to read. I tried the following snippet but I don't see any
difference:

<match target="font" >
	<test name="weight" compare="more">
		<int>100</int>
	</test>
	<edit mode="assign" name="weight" >
		<const>100</const>
	</edit>
</match>

How would you do? Can I do it, if not, can we make normal fonts a
little bit bolder and use them instead of bold fonts? How can I do it?
Thanks,

-- 
Charles A. Landemaine.