This is a video of a fire call in a Portuguese town, where a low-pitched siren is in alert and a higher-pitched siren is in attack. The high siren almost sounds like it is switched by hand.
http://www.youtube.com/watch?v=cnWQXJdGFIM
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Daniel
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Strange siren setup in Portugal
Lex orandi, lex credendi, lex vivendi.
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