v21.77 + v21.76

New debarker machine sounds. [ATS edition]
Added standalone Sound Fixes Pack variant for the English Doug [Raspy] voice navigation.

v21.75

Reworked default retarder stick sound.
Reworked default windshield wiper sounds for dry and wet conditions.
Complete rework of suspension / tire bump sounds.
Toned down the default debarker machine ambience. [ATS edition]
Removed some default prefab machinery sounds due to excessive loudness in game environment - will be reworked. [ATS edition]

v21.74

2 new suspension / tire bump sounds added.
Small enhancement for the fuel cap twisting sounds for after refuelling.

v21.73

Replaced the default low air warning sound.

v21.72

Improved sound mix for driving over grass.
Optional feature: Switched Driver Alert Support sound to the one from a modern Peterbilt. [ATS edition]

v21.71 + v21.70

Modified interior and exterior rain sound effects.
Added possibility of nickering sounds for one of the horse animations when close to a horse.

v21.69

Horn sound added to the Tesla Model S (pre-2016 redesign) in AI traffic. [ATS edition]
New seatbelt click sound when getting back into the truck after refuelling.
Accentuated some parts of the gravel sound mix and improved its volume attenuation.
Replaced 1 tire bump / suspension sound.

v21.68 - The big ATS train sound update!

Tweaked interior dynamic effects for the default light switch sound and hazard warning button sound for a more 3D feel.
Improved deceleration sound behavior of Greyhound MCI MC-12 bus. [ATS edition]
Reduced helicopter sound volume when the helicopter is more distant.
Horn sound added to the 2015 Ford Mustang (6th generation) in AI traffic.
Included 1 more engine sound effect for the 2015 Ford Mustang (6th generation) V8 sound variant in AI traffic.
Reworked some sound effects for the BNSF EMD SD40 locomotive. [ATS edition]
Tweaked sound behavior of standalone air horn - now has a fixed volume.
Discontinued wet tire effect feature for default AI car sound since it can't be made fully compatible with 1.41.

[ATS edition]
Comprehensive features applied to the Union Pacific 2572 and the Amtrak P42DC locomotives, including but not limited to:
- Locomotive engine sounds
- E-bell for slow speeds
- Brake squeals
- Better volume attenuation

v21.67

In addition to the V6 engine sounds for the Ford Mustang 2015 in AI traffic:
- V8 and Ecoboost engine sound variants have been added

v21.66

Engine sounds added for the 2015 Ford Mustang (6th generation) in AI traffic.
Limited high duplication of default railroad crossing bell sound.
Comprehensive audio applied to the New Mexico Rail Runner Express MPI MP36PH-3C locomotive, including but not limited to:
- Passenger railcar sounds
- Locomotive engine sounds
- E-bell for slow speeds
- Brake squeals
- Better volume attenuation