Here I am again. Going back and reading les's post properly, there are 2 points to note. 1. This is code for 2 master channels, each of which controls a slave. Mine is for 1 master controlling 2 slaves simultaneously. You can do it either way to suit yourself. 2. Les says 'The slaved channel will read its value from any channel named "OpenLeftDoor", it does not have to be a "valueParm" channel' Thsi is why I call mine 'vp - yaddayadda - dx' That way, it can only read from the master channel. Whew! Exhausted.... mac