TS12 Doppler Effects Configuration
TS12 introduces Doppler sound effects for diesel (and maybe electric?) locomotives. This is the effect where a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession. See wikipedia for more information .
To implement this effect some additional lines need to be added to the config.txt file of the locomotive sound asset, which has the KIND Enginesound. When searching in Content Manager use Category > Train Engine Sounds to display the sound assets available.
The additional tags required are :
engine-sound-ramp-up-durations soundfile length* [start.wav,up 1 - 2.wav,up 2 - 3.wav,up 3 - 4.wav,up 4 - 5.wav,up 5 - 6.wav,up 6 - 7.wav,up 7 - 8.wav]
engine-sound-ramp-down-durations soundfile length* [stop.wav,down 2 - 1.wav,down 3 - 2.wav,down 4 - 3.wav,down 5 - 4.wav,down 6 - 5.wav,down 7 - 6.wav,down 8 - 7.wav]
- in seconds to 3 decimal places
If there is no start.wav or stop.wav then enter 0 as the first number.
See the wiki entry for KIND Enginesound for more details 
From the built-in TEM2-Enginesound,<kuid2:149682:1000002:1>
From the built-in BR Class 37 enginesounds v2,<kuid:2512:53374>, which has no start.wav or stop.wav files.
There is also a tag called :
but I don't know what that does!
--stovepipe 12:46, 14 April 2012 (UTC)