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You can not adjust the tone of the factory horn. You must replace the horn to get a different sound.
In a "Quiet" Hospital Zone.
whistle or horn
200 feet
A whistle or some other mechanical means (horn) to make a sound AND a bell
whistle or horn AND a bell
Yes you must at least have a built in mic and a software in your OS.
Air horns are legal in Queensland as long as they only play one note (musical air horns are illegal). The ADR rules state that they can't be on a fixed cycle, ie, you press your horn button and the horn makes continuous sound for a set time and then turns itself off. It must start with the press of the horn button and must stop when the horn button is released. Also your horn must play one single continuous note with the horn button depressed. Your horn can be powered by any means including air.
It is called a shofar, and may be made from the horn of just about any ruminant except a cow. The minimum dimension is that if you hold it in your fist, the mouthpiece must protrude on one side and the "bell" of the horn on the other side. Bigger ones sound better!
A whistle or horn
This means the horn must be fully outlined.
The studio microphone must be installed where the sound is to be produced. It can be near speaking area but not near sofa or so as it may captured sitting sound.