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One thing to keep in mind: If a given train horn is (really) loud up close, it will still be (fairly) loud even a 1/2 mile away.
Sound intensity level decreases, with doubling of the distance, by −6 dB. Which means if you do the math: If a given train horn's SPL =120 db at 10 feet, then the horn's SPL = 72 db at 2640 feet (1/2-mile)
SPL = 120 db = ~volume of a rock concert, sitting on the front row (Really LOUD!)
SPL = 72 db = ~volume of vacuum cleaner running, at 3 feet (Still pretty loud!)
Have you checked that the 3D sound effect is turned on under Main Menu > Options > Sound Settings?
Shane
I would suggest you compare your modified assets against ones that do work in that case.
Shane
see post 3 above...
Is the doppler effect how horns distort or fade in volume as they pass?
No. The doppler effect is the change in pitch as the sound approaches and then recedes. The higher the speed of approach the higher the pitch - the higher the speed at which it recedes, the lower the pitch.
http://en.wikipedia.org/wiki/Doppler_effect