I was trying to find a way to modulate the gain of an eq band using a sidechain audio signal in Ardour, since it is not easy to find an EQ plugin that has a builted-in sidechain on Linux
Making a research on google I found an interesting video on a LUA script doing something similar to what I was thinking:
Anyone can explain me how the script shown in this video can be loaded and linked to a certain plugin?
That video shows prototype that was never completed.
I think http://eq10q.sourceforge.net/ has some side-chain filter. Other than that you could use ingen (or some modular synth environment) and patch some EQ with envelope follower.
Thank you for the replies.
It would be nice to have the possibility to complete the LUA script in Ardour in order to modulate a generic plugin.
For the moment I will take a look to your suggestions
Currently on LV2 plugins can provide port meta-data for plugin I/O and flag ports as explicit side-chain input.
However, after adding a plugin, you can manually add/remove/connect side-chain by customizing Pin-connections. This is also how it works for VST2.x. plugins.