Marchetti: By Low; High-rev Approach, Fast By And Medium Low Away. Medium To Distant Perspective. Jet.

Marchetti: By Low; Rumble And Low Whine, Approach, By And Away. Jet.

Marchetti: By Medium; Distant Jet Approach With Rising Whine, Extremely Fast By, Long Away. Medium To Distant Perspective. Jet.

Marchetti: Slow By; Slow Taxi By, High-pitched Engine At Low Rpm. Close To Medium Perspective. Jet.

Marchetti: Slow Circle; Timbre Of Jet Changes With Direction And Distance. Varies From Low-pitched Drone To Sharp, Hissing Whine. Close To Medium Perspective. Jet.