1) Press "START".
2) Your game must be loaded (loading screen is dissapeared) only when plane is alredy on fly.
3) No sound is present untill you press "F" (jump out a plane).
Date seen: since release till today.
Troubleshooting Attempted: reinstalling the game, reinstalling OS, buying new PC, etc.
Launch Options: no options.
Operating System: Windows 10, 1709 build
Graphics Card: GTX 950
CPU: Ryzen R7 1700
RAM: 16 Gb
Additional information may be requested, but this is an old bug, caused not by gamer's crooked hands.
P. S. I'm ready to help with debugging code.