Jim is right on.
Normally you would not have models with duplicate channels, like when sequencing in LOR.
When we gave the ability in xlights to create multiple models, all with the same channel range , we introduced complexity.
We did this so you could sequence your individual arches or put effects on all of them at the same time.
Then along came Whole House Model. This , for sure, duplicates channels.
What is displayed in teh preview has nothing to do with what we create in NUTCRACKER. The only thing that causes effects to be created is having entries in the NUTCRACKER grid.
An example, suppose you have the following models as columns in your grid
Arch 1, ch 101-200
Arch 2. ch 201-300
Arch 3, ch 301-400
AllArches, ch 101-400
Whole House Model, Channels 1-5000
the first row could have
arch1=twinkle, arch2=bars,arc3=colorwash, allarches=none,none, WHM=none,none
second row
arch1=none,none, arch2=none,none,arch3=none,none,allarches=strobe,WHM=none,none
third row
arch1=none,none, arch2=none,none,arch3=none,none,allarches=none,none,WHM=butterfly
What this does:
first row
arch1 has twinkle effect
arch2 has bars
arch3 has colorwash
second row
arch 1,2,3 all are strobing.
third row
arch 1,2,3 are playing teh butterfly effect (along with all other elements in your yard)
so when entering effects in the grid
if models overlap, only have one that has the effect , the others should be set to "None.None"