ATTENTION! I made mod for myself and maybe you do not need it.
mod: -=(  ETS2_Sound_N028_for_trucks_v1.56_.scs
This sound mod for ETS2 changes the sound  trucks regardless of the engine installed.
See list of trucks below.

List default trucks SCS  in ETS2:
       - daf.2021 
        - daf.xd 
        - daf.xf 
        - daf.xf_euro6 
        - iveco.hiway 
        - iveco.stralis 
        - iveco.sway 
        - man.tgx 
        - man.tgx_2020 
        - man.tgx_euro6 
        - mercedes.actros 
        - mercedes.actros2014 
        - renault.etech_t 
        - renault.magnum 
        - renault.premium 
        - renault.t 
        - scania.r 
        - scania.r_2016 
        - scania.streamline 
        - scania.s_2016 
        - scania.s_2024e 
        - volvo.fh16 
        - volvo.fh16_2012 
        - volvo.fh_2021 
       - volvo.fh_2024 

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____ USER MANUAL:
Recommended! Set all truck sound settings in the game to 50%.
ATTENTION!  This mod do not change the game process. 
You can use sound mod at any time, it's enough to leave the game and on/off or replace mod then continue the game.
 - - To work correctly, use any, but only one mod from this series.

Credits
bobo58