As for plugins: currently each audio application has own plugin browser. In
some cases it is very handy (ingen, carla), sometimes awful (audacity, may be
more). My hope is to make it external with filemanager-like workflow.
Dragging to jack patchbay canvas may be used to load plugin in single host
(not sure, what about instrument, since there is usually separate sampler
engine, usually managing all instruments).
Not implemented:
Just have to learn VAMP and somehow try VST - for some completeness.