The idea with the WallsOfSound plug-in is to emulate, in a way most general as possible, the reverberant effects of sound travelling from sources to receivers in a three-dimensional space -- bounded, fully or partially, by walls of specified sonic reflectivity coefficients.

Rather than control reverb and echo with the conventional knob or slider-driven, single-dimensional delay parameters and the like, reverberant effects would be created by actually creating a virtual room and laying out sources and receivers in the three dimensions – a more intuitive approach.