what directory should the plugins be placed in for demudi agnula. ardour does not recognize them.
Plugins are typically installed in /usr/local/lib/ladspa. You can also set LADSPA_PATH in your environment and Ardour will check that location(s) instead.
Actually, I think /usr/lib/ladspa is a more typical location. At least that’s the folder where most pre-built packages and distributions install the plugins.