Your mega tree is 840 rgb nodes. Say it starts on channel 1025,
You build the mega tree model, set the models starting track. Add an effect, like butterfly. Save it as an xseq file.
Now don't use "export", use "export model" and create a lcb file for lor, vir for vixen.
Export model will only export the channels that are defined in a model.
Export will produce every channel defined in the setup tab.
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