NCE Mini-Panel and F2

Bill Wilken
 

If I toggle F2 on my NCE cab, I can start and stop a horn blowing in any of my locos, regardless of decoder.  But if I summon F2 via my NCE Mini-Panel, once the horn begins to blow there seems to be no way to stop it.  The decoder model in the loco makes no difference.  Am I missing something obvious or does this simply fall into the category, "one of those things?"

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