[NTG-context] \definefallbackfamily for math fonts, again

Dear list members: I have the following context code: \definefontfamily [doc] [rm] [TeX Gyre Bonum] \definefontfamily [doc] [ss] [Tex Gyre Adventor] \definefallbackfamily [doc] [mm] [Tex Gyre Adventor] [range=0x00000-0x2FA1F,force=yes] \definefontfamily [doc] [mm] [TeX Gyre Pagella Math] \setupbodyfont[doc,10pt] \starttext Text font: <SERIF C H O N P>, {\ss <SANS SERIF C H O N P>} \\ Math font: \m{}, \m{\rm }, \m{\ss } \stoptext 1. In the pdf result \rm math font is Tex Gyre Adventor and \ss math is Tex Gyre Pagella. How can I have context to print math \rm with Tex Gyre Pagella serif, and math \ss with Tex Gyre Adventor font? Why a roman/serif font is replaced with a sans serif font? 2. What range would be the most correct to include all characters for replacement? Thank you in advance, bcsikos