Sound Particles 4FX BundleDoppler simulates the behaviour of objects moving through air, providing audio with highly accurate characteristics of sounds passing by. With control of all parameters that physically affect pitch, level and EQ in a real world situation, Doppler gives you the most natural sounding emulation for your work. FeaturesHighly Accurate Doppler: Accurate means Natural because the brain knows what is natural and what is fake, you need the most accurate tools.