Hi,
Here's a kb3 program (BeeThreeInARoom) with a room reverb on Aux1. The idea was to mimic a sound of a real B3 in a real room (the room fx is best judged with headphones).
This program has an "all out" drawbar setting with lots of drawbar leakage so it might sound a bit dirty with other drawbar settings (like 888000000). This can of course be easily fixed by lowering the leakage level.

Enjoy!

Thin_i