I've patched the LADSPA SDK with the proposed non-sequential additions and
updated listplugins, applyplugin and analyseplugin. These programs are now
something of a mess and in need of a rewrite, but appear to work (with the
constraint that applyplugin only allows non-sequential plugins for which
all inputs are non-sequential). I've also added the reverse plugin and
backed out the Default parameter :-(
If anyone is interested, there's a pre-release copy at
http://www.ladspa.org/download/ladspa_sdk_ns_pre.tgz.
--Richard