Partime,
Seeing as you have an A/B switch this would be easy.
I would recommend the AR 32 System.
http://www.elationlighting.com/product.asp?ProductIDNum...ecorder%20Controller
You can use Compu live to set your preset intensity levels, and mount this on the wall.
When Compu is Off and your set to B, then the AR-32 can run your house lights.