I take it your reference to a "Code 3 tone" is to one of the several "alert tones" that most dispatch consoles are capable of generating.
Some of the alert tones are simply a burst of a single tone. Most Motorola radios can be programmed for QCII, and a QCII radio can be programmed to open audio for a QCII "group call," which is simply a long burst of a single tone.
I'm not aware of any decoders that would respond to the hi-lo, warble, siren or series-of-beeps types of alert tones.
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