[NTG-context] Adjust the tracking

[Marco]

Hi everybody,

how does one adjust the tracking of a font? The command
\definecharacterkerning does almost what I need. However, it breaks
the ligatures.

\definecharacterkerning [track] [factor=.01]
\starttext
\showboxes
\switchtobodyfont [72pt]
final suffocating flange

% all ligatures lost
\setcharacterkerning [track]
final suffocating flange
\stoptext


Marco