v21.48

Improved air brake sounds can now sometimes be heard when any bus or truck in AI traffic comes to a stop.
Replaced the air gear sound for AI traffic trucks. It can sometimes be heard when the AI traffic truck changes gear.
Replaced 1 default air brake sound effect.
Added 1 default air brake sound effect.
Refined engine slowdown sound for the MCI MC-12 in AI traffic. [ATS edition]
Removed high RPM sounds for revs that don't seem to be reached at all from the MCI MC-12 in AI traffic. [ATS edition]
Quietened Boeing 737 taxiing sound in scenarios where there are multiple planes taxiing in the same airport.
Reduced range of Boeing 737 taxiing sound.
Optimizations for sound files without quality loss. [ATS edition]

v21.47

New version of trailer brace rotation sounds.
3D positioned trailer brace rotation sounds.
Engine sounds added for the Mercedes-Benz C-Class (W204 2008) in AI traffic.
Minor sound mix tweaks for default AI car tire sounds.
Optimizations for sound files without quality loss.

v21.46

Added 1 new sound variant for when coupling trailer.
3D positioned and enhanced the trailer coupling sounds.
Engine and horn sounds added for the Honda Accord (8th generation) in AI traffic.
Engine and horn sounds added for the Toyota Prius (XW30 generation) in AI traffic. [ATS edition]
Horn sound added for the Audi A6 (C6 generation) in AI traffic.
Minor sound mix tweaks for the MCI MC-12 in AI traffic. [ATS edition]
Optimizations for sound files without quality loss.

v21.45

Engine sounds added to the Harley Davidson Fat Boy in the Motorcycle Traffic Pack by Jazzycat.
Applied Harley Davidson Fat Boy sounds as the default motorcycle sound in the Motorcycle Traffic Pack by Jazzycat.
Volume balance tweaks for the BMW S1000RR in the Motorcycle Traffic Pack by Jazzycat.

v21.44

Added engine sounds to the Land Rover Range Rover (L322 generation) in AI traffic.
Optimizations for sound files without quality loss.

v21.43

Added standalone air horn that you can add to your truck, with realistic attenuation outside and cabin vibration inside.
Recommended audio settings text file updated.

v21.42

Fixed bug in the vanilla game where train horns did not attenuate realistically by distance. [ATS edition]
Reduced volume of train horns used at crossings to a more balanced level. [ATS edition]

v21.41

Added engine sound to the Audi A6 (C6 generation) in AI traffic.
Minor sound mix tweaks for the MCI MC-12 and the 2015 Subaru WRX STI in AI traffic. [ATS edition]

v21.40

Implemented interior suspension sounds.

v21.39

Dynamically enhanced sound of driving over sleeper lines at lower speeds (useful for sleeper lines featured in the Iberia DLC).
Custom exterior suspension sounds finally restored.
Authentically volume balanced high quality gravel sounds.
Authentically volume balanced scrap yard sounds and added cricket sounds for nighttime. [ATS edition]
Removed scrap yard sounds completely for nighttime when workers are not present, unlike in the vanilla game. [ATS edition]
Deleted excess reverb from the default automated gate sound.
Real engine sounds added to the BMW S1000RR in the Motorcycle Traffic Pack by Jazzycat.
Applied BMW S1000RR sounds as the default motorcycle sound in the Motorcycle Traffic Pack by Jazzycat (temporary until the rest of individual motorcycle sounds are done).
Finetuned F22 jet fighter sound. [ATS edition]
Optimizations for sound files without quality loss.