EU4 Sound stuttering/echo

I see you have three audio channels there. Does the same thing happen via all 3 ?

Our similar game Crusader Kings 2 is free to play on Steam now, does it also have this problem?  

DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach here your Documents/Paradox Interactive/Europa Universalis IV/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/Europa Universalis IV/logs/ folder, attach here system.log , error.log .