Scania Nextgen I6 Sound V4.1 ETS2 1.40

Changelog for Version 4.1:
added a manual version with different engine start/stop sounds & different air-gear sounds from a real Scania NG with manual gearbox
improved idle sound
overall engine sound slightly reworked
reduced compressor volume
new Opticruise gearbox sounds (normal version)
new engine brake sounds
engaging engine brake when shifting up (normal version only!)
reduced retarder volume & added smooth transition
new light-switch sounds
better turbo sound
Supported game versions: ETS2 – (1.40.x)

Authors: - SCS - Kriechbaum - Max2712