Scott
The latest PB 40/24 is actually 7 input/output channels now, with the seven output split 3-3-4-4-4-3-3, for 24 servos used!
The system isolates the Rx from load, so you should always run at least one servo/device directly through the Rx. All Rx's are tuned with some load from servos.
The idea is you run the seven highest load control set ups through the PB and the remaining three channels through the Rx.
Look at
www.powerbox-systems.com for a full English set of notes.
They are the finest devices you can use!
Dave Wilshere