Would just like to throw this out there as well. What about T's on a live ball? The first camp I went to I was taught to toot it a couple of times, let all the attention focus on you, and then give the T signal, the reason for this was so that you don't give the T so quickly that no one but a few people see it and no one knows what has happened. Just tossing it out there.

One long loud whistle.. I've been in gyms that have 2 or 3 thousand fans. If you don't blow long and loud the players may not hear your whistle and continue play. Especially in rival games and close games. I've expereinced it when I first started refereeing..

Also by it being long and loud, it will differentiate from the screeching sounds that the sneakers make by the players.

I double on travel calls only....everything else is a single...trying to break the habit but having a heck of a time doing it.

My Foxes works just fine.
One tweet always stops play.
mick

I found many double tweet on travelling especially in USA. Personally I only do once and may be multiple for fight(I officiate under FIBA rules, and the book says only blow once...). The most impressive thing to me was that I saw a FIBA ref blowing 10 times very rapidly for a lay-up charging, excellent mouth skill but silly enough like training puppy.

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In my not always so humble opinion, I wouldn't do it. Give the T without being overzealous or overdramatic and go on with the game. Multiple whistles seem to draw too much attention to it for me.