LADSPA is a standard that allows software audio processors and effects to be plugged into a
wide range of audio synthesis and recording packages.
If enabled, Liquidsoap supports LADSPA plugins. In this case,
installed plugins are detected at run-time and are all available in Liquidsoap under a name
of the form: ladspa.plugin, for instance ladspa.karaoke, ladspa.flanger etc..
The full list of those operators can be found using liquidsoap --list-plugins.
Also, as usual, liquidsoap -h ladspa.plugin returns a detailed description of each LADSPA's operators.
For advanced users, it is worth nothing that most of the parameters associated with LADSPA operators
can take a function, for instance in the above: max_slowdown : anything that is either float or ()->float.
This means that those parameters may be dynamically changed while running a liquidsoap script.