v2.1
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- NEW - Added engine variant with a standard factory exhaust with silencer.
- Added randomisation to clutch-fan and start delay
- Improved the blending between unloaded and loaded exhaust sounds.
- Increased the volume of the unloaded and off the gas exhaust sound.
- Added multi-stage jake brake sounds.
- Improved the volume attenuation for engine and exhaust.

v2.0.2
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- Adjusted the exhaust loaded/unloaded volume curve so that it sounds more natural.
- Changed the trigger point for the BOV.

v2.0.1
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- Increased the range of the mid RPM sounds (better diesel chatter between 1000-1500RPM).
- Increased the volume of the turbo slightly and rearranged its volume map.
- Reduced fan volume slightly.
- Few other small tweaks.

v2.0.0
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- Re-engineered all of the audio, major improvements all round.
- Refactored the FMOD setup, major improvements all round.
- Added SCS Western Star.
- Added SCS Freightliner Cascadia.
- Added Kenworth W900 Highway Killer (by Jon-Ruda).
- Features a custom volume attenuation system, meaning the exhaust can be heared from a greater distance than the engine.
- Added support for ATS v1.39.

1.3.2b
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- Added Kenworth W900B (GTM)
- Added Kenworth T800 (GTM)
- Added Kenworth T610 (GTM)
- Added Peterbilt 567 (GTM)
- Removed International LT due to errors (will look into this).