I believe the ZW-L, while having the 4 channel voltage control PowerMaster functionality internally, does not have the MTH Macros built in like the TPC or Legacy PowerMaster units. I personally use Legacy PowerMasters and find the builtin MTH Macros are very effective, but so is manually keying. Some example excerpts:
https://www.mthtrains.com/site...ction/20dl16606i.pdf
@Mellow Hudson Mike, the ZW-L manual does not have much to say about MTH control:
https://www.lionelsupport.com/...7921250ZWLManual.pdf
This is in contrast with the Legacy PowerMaster user Manual which has pages on MTH operation, the following just an sample: