Hello, I have found that changing: x=0; to: x=1; at line 200 of the file gtk1_ardour/ladspa_pluginui.cc allows to have max 8 controls in each column of the the ladspa GUI. Not 8 or 9. Before: http://nolv.free.fr/ardour/ardour2_tapeqbw_before.png After: http://nolv.free.fr/ardour/ardour2_tapeqbw_after.png -- Olivier