Compressor for ardour 4

Getting Stuff Done How do I .... ?
#1

So, Im using a pretty old version ardour 4 with kubuntu. I have several plugins added but no compressor. Makes my vocal editing hard. Sny suggestions? Thanks.

#2

The lsp plugins are very good!

https://lsp-plug.in/

#3

Perhaps this one:

It is written by one of the lead developers and may be compatible with older versions of Ardour.