This is a programmable reverb effect, based on the hardware algorithm of the Sony PlayStation game console. All parameters are fully configurable, and it includes several reverb presets based on available documentation of SDK settings.
It supports mono which it upmixes to stereo, stereo, and 4 channel surround signals. 4 channel is spread between front and rear, so the included upmix which converts stereo to 4 channel with silence in the rear will spread the front signal to the rear as reverb. (Another channel mixer would also be suitable for upmixing other sources, or for downmixing 5.1 to 4.0.)
1.3, released on 2017-02-04