>
> - 1 KHz modulated at 4 Hz.
>
> - 1 KHz gated at 4 Hz.
>
> - 1 Khz warble.
>
> - High picthed warble
>
> - Modulated high pitch tone
>
> - 4 Hz modulated high pitch tone.
>
> - 1 KHz tone gated on and onff at 4 hz
>
> - 1 KHz tone switched on and off at 4 hz
>
> And, of course :-)
>
> - a 1Khz sound that pulsates at about 4Hz

How about "Warning sound" ?
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