This room modelling program solves the wave equation in 3-D spaces, here a specific large concert hall of volume 12,500 cubic meters (for 44,100 samples/sec*) with the "Golden Ratio" for its dimensions. Please see YouTube channel for EXE Consulting for introductory video. Please see SoundCloud for EXE Consulting for songs that employ this room modeller. VST2/VST3 again.
(*) 9,694 cubic meters for 48,000; 1,462.5 cubic meters for 88,200; 1,212 cubic meters for 96,000. In other words, much smaller room size for higher rates. This may change for future versions.