\definefontfallback [whatever] [Slanted] [0x0060-0x007F]
\definefontfallback [whatever] [Bold] [0x0080-0x00FF,0x00A0-0x00AF]
\definefontfallback [whatever] [BoldSlanted] [0x00C0-0x00C7]
What's the meaning of the third parameter? Unicode ranges?
Oliver
