Dynamic Range Destroyer (DRD.lv2 or simply DRD) is an audio compressor plugin
that aims to remove changes in volume from an audio stream. This effect is
also called auto volume levelling, volume normalization, or "stable volume."
It supports mono, stereo, 6-channel, and 8-channel streams, and it preserves
the balance among channels.
https://github.com/DaveFlater/DRD