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Pre-programmed bullhorn

program different "yells" in an electronic bullhorn
 
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There are personal recording devices that allow a few seconds of recorded messages for various purposes. Incorporate that idea with numerous coded messages combined with a megawatt bullhorn and voila...GO HALFBAKERY!!!
dt, Apr 24 2003

Baked from a musical perspective http://www.radiosha...duct%5Fid=32%2D2037
Plays American College Fight songs when you press the code, and it's not "Mega" watts, but it pretty much bakes the idea. [Canuck, Oct 04 2004]

This recorder comes with a "megaphone" option http://www.jnc-digi...dexproductsdvr.html
...but it's by no means clear if it's loud enough for the uses you envision. [DrCurry, Oct 04 2004]

[link]






       The US troops in Iraq were using loudspeakers with various pre-recorded messages in Arabic, so sort of Baked in a military context.
DrCurry, Apr 24 2003
  

       [marked for deletion] BAKED! The Shack has only had this for about 30 years...
Canuck, Apr 25 2003
  

       More to the point, dt does specifically ask for recorded messages, not tunes, and presumably intends ones recorded by the user. While you can "record" new tunes on that bullhorn, that actually appears to entail mimicing them with dial tones.
DrCurry, Apr 25 2003
  
      
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