[NTG-context] issue loading fonts

Dear list, I have the following sample: \definefontfamily [mainface] [rm] [Pagella] [tf={file:texgyrepagella-regular.otf}, bf={file:texgyrepagella-regular-500.otf}, it={file:texgyrepagella-regular-2000.otf}] \setupbodyfont[mainface] \starttext normal\\ \bf bold\\ \it italics \stoptext Sorry, but I don’t get the fonts for \bf and \it loaded. What am I doing wrong? Many thanks for your help, Pablo -- http://www.ousia.tk