The default chord is derived from the shape of bes:7, so it requires a barré.
But there's also a handy shape in first position. Shouldn't this be the default?
I've tried to change the definition but there's something wrong, see below:
\version "2.17.27"
\storePredefinedDiagram #default-fret-table \chordmode {b:7}
#guitar-tuning
%#(offset-fret 1 (chord-shape 'bes:7 guitar-tuning))
#"x;2-2;1-1;2-3;o;2-4"
chordsGuitar = \chordmode {
b:7
}
\score {
<<
\new ChordNames \chordsGuitar
\new FretBoards \chordsGuitar
>>
}
% the change above is not working as expected
% this is what I'm trying to produce:
\markup { \fret-diagram #"6-x;5-2;4-1;3-2;2-o;1-2;" }