LADSPA Calf Compressor and classical music

I posted a few years back about Chris’s Dynamic Compressor and while it works very well, I happened upon the CALF Compressor plugin for Audacity and to my ears, using the CALF Compressor makes my mp3 music sound a bit “cleaner”. I’d like to find out how, though, to increase the gain of the softer parts of the classical music just a little bit. Help is appreciated.

Set the threshold low, and the Ratio low.