It is a Broadcast Voice Leveler and will try to get the signal on a configured level within parameters of max attenuation and gain fir fast medium and slow dynamics.
Is it a multiband compressor? Is it a dynamic EQ?
GMulti is a multiband compressor with an unique gui.
“NastyVCS stays on the musical (and not the surgical) side of the audio source”. Damn, I cannot say this better myself.