Hi, i've installed cbus in my house and being an old style i installed heritage surface switches connected to 2 & 4 channell bus couplers.The problem i'm having is that a switch turns on a light,but when turning off from another switch it takes a double action ( on/off or off/on ).The couplers are set as bell press which works better than having them as just on/off. I have several 2 ways & intermediate switchings in the house so it is becoming very frustrating. Help Tommy.