Enable and the Console in your config.cfg file by changing uset g_developer "0" to "1" and uset g_console "0" to "1" .
Find the "Sound Pack for all Trucks" and move it to the list. SOUND PACK FOR ALL TRUCKS 1.36 UPDATE
: Lowered volume for ferry and train sounds, while cabin sounds were raised and tweaked for better immersion. Enable and the Console in your config