The VCF 303 ladspa plugin

What does trigger do? Does it reset the mod envelope? (That would be useful!)

More importantly, what does it trigger on? It would be nice to be able to trigger on peaks on another track…

Not really used this one.
It triggers on the start of the selection.

The interface does not tell you much - I think it was probably written for another LADSPA compatible program rather than Audacity, but it does make some interesting effects. Try running it on a few seconds of white noise to hear what it does. (try different settings).

Aw, that’s lame. Time to start hacking LADSPA and C (sigh - I hate that language) I guess.