EDIT: Never mind. Installed the latest software on my Pi and all eight stations are available with the masters set to none.
Looking at getting this for a spare Pi2 board I have. Currently on the demo site messing with settings and would like to know about the master valve.
I have 8 stations and a manual master valve. In the demo software I disabled the Master Valve. When I did this thought I can now only see seven stations and not the full eight. Am I missing something? If I enable a master and set it to station one wont this always be turned on when the other stations are run?