Pregame I always tell my partner that we will have a whistle on all subs. I inform the table that only use the horn to get our attention and not to hit the horn for all subs (only do so if we do not notice).
I as a habit always whistle in subs, and I do think its a good thing to do as it forces you to be more aware as well as gives the impression that you are covering everything you need to and are aware of what is going on.
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in OS I trust
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