> Say you have a device that indicates an "error" condition by quickly
> flashing the LED, and emitting a 1Khz sound that pulsates at about 
> 4Hz
> (on/off).

- 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



        Russell

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