Adjusted room layout for BT studio
Revert "Disabled auto enable/disable (temporarily?) - for CCRMA demo"

This reverts commit 8466d8752762cfd877e87f4d8081fb6dfdc9b796.
Added comment explaining operation
Added support for using variance of reference to disable hard background detections; added bgprob()
plotvisible now plots different colors for different vorig codes
Improved usage documentation