It's tough to write a question to cover all types and vintages of aircraft. Audio source can be the TAWS, the radio altimeter, or something like the OWL card in the 757.
Earlier Arinc conforming radio altimeters would track from about 2800 feet on down, while the display would be limited to 2500 feet. Newer (767 & subsequent designs) Arinc 700 radio altimeters track from about 5,000 feet, but again, the display is limited to 2,500 feet, as the original design intent of the radio altimeter is as a landing aid from about 200 feet on down.
All other functions, such as Autothrottle Retard, are afterthoughts, and often not well thought out, as maybe shown by the Turkish 737 at EHAM.
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