In TeX-exported diagrams, the comments (i.e., the MSC comment elements) are shrinked to just a single line. When the comments are long, a line-break would be useful (essential).
The problem is not in the exporting algorithm (the result of which could, at worst, be fixed by hand), but rather in the \hmsccomment macro definition, which allows neither \\ nor \par within its argument. The macro should be redefined and the exporting algorithm should be modified so that it generated multiline comments (ideally, with the same line-breaks as in the drawing in Visio).
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