How to use font variations such as Condensed, SemiExtended etc

[mes...@gmail.com]

Hi, I'm using a font called MyriadPro, which has Regular, Bold, Italic and BoldIt of course, but also Condensed, SemiExtended and others. I want to use MyriadPro-BlackSemiExt for my "heading1" lines but they just come out as MyriadPro-Regular.

The relevant bits from my stylesheet are:

  fontsAlias:
    stdFont: MyriadPro-Regular
    stdBold: MyriadPro-Bold
    stdItalic: MyriadPro-It
    stdBoldItalic: MyriadPro-BoldIt
    stdBlack: MyriadPro-BlackSemiExt

    heading1:
      parent: heading
      fontName: stdBlack
      fontSize: 16

How can I get my headings into MyriadPro-BlackSemiExt?

Any and all help appreciated.