Hi ckobu
Thanks for responding.
Here is what I did that caused the problem.
In a nutshell, I imported a multipad channel into a style channel using XGWorks via MixMaster.
The i used Assembly to import that channel into another style.
Here are the exact steps I performed:
I opened a style in MixMaster. Then I used the "Go To" menu in MixMaster to open XG Works to edit the Style.
In XG Works I went to the Menu > Plugin > Importer and I imported a channel from a Multipad into the Style.
I saved in XG Works. Then I closed XG Works.
Then I saved the Style from MixMaster.
The Multipad channel that I imported into the Style, played perfectly in the Style.
But when I used Assembly to import that Style channel that came from the multipad into another style, the channel made no sound in the style in imported it into.
As I said above, the workaround that I used to fix the problem of the channel not sounding, works consistently.
That workaround that I used is to play the channel in Style Creator > Step Record page. Then resave the Style from Style Creator.