\defaultfontfeatures[Computer Modern Graded G10 Typewriter]{
  Extension=.otf,
  UprightFont=ComputerModernGradedG10Typewriter10Regular,
  ItalicFont=ComputerModernGradedG10Typewriter10Italic,
  SlantedFont=ComputerModernGradedG10Typewriter10Slanted,
  SmallCapsFont=ComputerModernGradedG10Typewriter10SmallCaps,
  UprightFeatures = {
    SizeFeatures = {
      {Size={-8.5}, Font=ComputerModernGradedG10Typewriter8Regular},
      {Size={8.5-9.5}, Font=ComputerModernGradedG10Typewriter9Regular},
      {Size={9.5-11.5}, Font=ComputerModernGradedG10Typewriter10Regular},
      {Size={11.5-}, Font=ComputerModernGradedG10Typewriter12Regular},
    }
  },
}