You have gotten great info and tips in all the posts.
I would just like to add this crude analogy
Think of each ZW-L output as a water pipe. Inside the ZW-L, think of two water valves in series feeding the output water pipe. One valve is open and closed by a ZW-L handle, and the second valve is open and closed by the CAB2 remote (addressing the output being controlled). If the handle is at 0, its analogous valve is closed, and thus no matter how much you turn up the second valve from the CAB2, no water comes out. Likewise, if the CAB2 has the output set to 0, its valve is closed, and no matter where the handle sets its valve, no water comes out.
So in normal operation from the CAB2, you set the handle to the max voltage you want to supply from its corresponding output, the control the voltage output using the CAB2 within the range set by the handle (0v to max volt handle is set at).
The corollary is true - if you want to emulate good old ZW voltage control from a ZW-L handle, set the handle to 0v, set the CAB2 to max voltage, then use the handle just like a ZW handle to control voltage.
