I think you want to set the ZW-L to "PROG" and "CMD" then address the handle you will use to set the voltage to the track (A-B-C-D right to left facing the front). I address them as 1-2-3-4. So, maybe handle A is set to power the track, as "Track 1".
Once it's set, turn slide switches back to "RUN", and the middle one to "CMD"
When running conventional locomotives, turn the control handle (again Track 1) to set max power at where you want to limit the speed. Place the conventional loco on the track, and vary the voltage to vary the speed from the Cab-2, The buttons for horn, whistle and direction still work from the handheld.
