With rgb nodes, the number represents lights. In other words if u have a start channel of 1000 in your custom model and you put the number 1,2,3 in the custom model. 1 is channels 1000,1001,1002. Number 2 is channels 1003,1004,1005. Say u are a lor user with 200 channels of ac. Those ac channels can be skipped and u start your custom whole house model at your first RGB channel.get a graph sheet and draw in your models. Or draw your house into an OpenOffice speak sheet. U must account for all channels. If you have 50 rgb nodes (150 channels) starting at 1000 and then your next model starts at 1200, u need to enter the appropriate node number