Unfortunately I have NO SOUND with the 64-bit executable. Sound works fine in 32-bit. I deleted the files under Documents in my user profile and completely removed the game. I then reinstalled it on a different hard drive.
My system is as follows:
Windows 10 64-bit (fully updated)
Core i7-2600k
ASUS P8Z77-V Pro
16GB RAM
ASUS Strix GTX 980 OC
Sound devices I've tried:
ASUS Xonar DSX internal sound card
S.M.S.L. M2 headphone DAC/AMP
Topping MX2 headphone DAC/AMP
I don't know what else I can do to make the sound work in 64-bit.