Two sound variants are based on Kapitan Kriechbaum's audios and another two from Odd_Fellow, adapted according to use of mods prior to 1.36 ATS.
The sounds of the Cummins ISX Signature are based on the sounds of Kapitan Kriechbaum for the 2015 versions of Euro Truck Simulator 2, and they are present in all the trucks on the list.
Tested on American Truck Simulator versions 1.39 to 1.46 beta per FMOD guidelines, includes engine sounds in the game's convoy mode (only available since version 1.42).
In addition, it contains two engines from Cummins ISX Signature line, dedicated especially for oversized and overweight loads:
ISX Signature 600
ISX Signature 720 Chipped
Contains the following variants:
In the file attached to the mod, "Truck Support Listing", it contains the list of trucks that the mod supports.