Vanilla Sounds Rework

Initial project to expand the vanilla sound from Amtrucks & Eurotrucks.

Sounds already improved/or added:

-ISX15/X15 Stock.

-CAT C15.

-Paccar MX-13.

-Volvo D13

Plans for the next updates are:

-Add Navistar engine.

-Add Detroit DD13-15 engine.

Credits:

miky