Font scales

Font scales

[AlterEgo Qasars]

Good evening!

One more problem (sorry): I need to typeset a document with specified 
font sizes. Font are postscript ones. I tried this:

\definefontsynonym [Serif]            [qtmr8z]
\definefontsynonym [SerifBold]        [qtmb8z]
\definefontsynonym [SerifItalic]      [qtmri8z]
\definefontsynonym [SerifSlanted]     [qtmri8z]
\definefontsynonym [SerifBoldItalic]  [qtmbi8z]
\definefontsynonym [SerifBoldSlanted] [qtmbi8z]
\definefontsynonym [SerifCaps]        [qtmr8z]
\definefontsynonym [Sans]             [phvr8z]
\definefontsynonym [SansBold]         [phvb8z]
\definefontsynonym [SansItalic]       [phvro8z]
\definefontsynonym [SansSlanted]      [phvro8z]
\definefontsynonym [SansBoldItalic]   [phvbo8z]
\definefontsynonym [SansBoldSlanted]  [phvbo8z]
\definefontsynonym [SansCaps]         [phvrc8z]
\definefontsynonym [MathRoman]        [txr][encoding=x5]
\definefontsynonym [MathExtension]    [txex]
\definefontsynonym [MathItalic]       [txmi]
\definefontsynonym [MathSymbol]       [txsy]
\definefontsynonym [MathRomanBold]     [txb][encoding=x5]
\definefontsynonym [MathExtensionBold] [txbex]
\definefontsynonym [MathItalicBold]    [txbmi]
\definefontsynonym [MathSymbolBold]    [txbsy]
\definefontsynonym [MathAlphaBold]     [LucidaNewMath-Arrows-Demi]
\definebodyfont [14.4pt,12pt,11pt,10pt,9pt,8pt,7pt,6pt,5pt]
        [rm,ss,mm] [default]
\definebodyfont [11pt] [ss] [bfa=SansBold at 13pt]
\definebodyfont [11pt] [ss] [bfb=SansBold at 14pt]
\definebodyfont [11pt] [ss] [bfc=SansBold at 20pt]
\definebodyfont [11pt] [ss] [bfe=SansBold at 75pt]
\definebodyfont [11pt] [ss] [tfxx=Sans at 9pt]
\definebodyfont [11pt] [ss] [bfxx=SansBold at 9pt]
\definebodyfont [11pt] [ss] [tfxxx=Sans at 8pt]
\definebodyfont [11pt] [ss] [bfxxx=SansBold at 8pt]
\setupbodyfont[11pt]
\setupinterlinespace[line=13pt]

Important are lines like 

\definebodyfont [11pt] [ss] [bfxx=SansBold at 9pt]

They don't work. How can I do it?

Many greetings.
M.K.