I've spotted a little problem with the wiki documentation:
Somewhere between 1.4 and 2.0 keygroups got renamed from 'kgroup' to 'keygroup'. The whole wiki seems to be using the current 2.0 lexicon, so the 1.3 and 1.4 pages for keygroups in the official documentation no longer display the belcanto phrases since 'kgroup' is no longer valid. They just show 'Error'.