The sound source. Every once in a while, you'll see the source emitting an impulse of sound towards the facade.
The facade. Different colors represent different parts of the facade. The sound gets attenuated when it passes through the facade. The isolation properties of the parts vary in the simulation.
The room. The sound bounces around the room. The colors represent the portion of the facade the sound originally passed through.
The impulse response. This rough approximation shows what the yellow listener would hear if the original sound source were a short impulse (like a gun shot).
The response. If the sound source consisted of noise, this is what a microphone would pick up in our situation. The thick line represents the sound pressure level, roughly relative to how a human would interpret it. The colors show which parts of the facade contribute the most to the perceived sound.