✏ EDIT: 90-synthetic.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <its:rules xmlns:its="http://www.w3.org/2005/11/its" version="1.0">
    <its:translateRule translate="no" selector="/fontconfig/*[not(self::description)]"/>
  </its:rules>

<match target="font">
		
		<test name="slant">
			<const>roman</const>
		</test>
		
		<test target="pattern" name="slant" compare="not_eq">
			<const>roman</const>
		</test>
		
		<edit name="matrix" mode="assign">
			<times>
				<name>matrix</name>
				<matrix><double>1</double><double>0.2</double>
					<double>0</double><double>1</double>
				</matrix>
			</times>
		</edit>
		
		<edit name="slant" mode="assign">
			<const>oblique</const>
		</edit>
		
		<edit name="embeddedbitmap" mode="assign">
			<bool>false</bool>
		</edit>
	</match>

<match target="font">
		
		<test name="weight" compare="less_eq">
			<const>medium</const>
		</test>
		
		<test target="pattern" name="weight" compare="more_eq">
			<const>bold</const>
		</test>
		
		<edit name="embolden" mode="assign">
			<bool>true</bool>
		</edit>
		
		<edit name="weight" mode="assign">
			<const>bold</const>
		</edit>
	</match>
</fontconfig>

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