I am sorry bother anyone in this forum.
I would like to ask some question and solution.

How am I able to set the sound just like it was when I was open Kuwo.
The sound volume is reduced till half when I switched out from the Kuwo application in Window 8.1.
Is there any other solution to maintain the original volume?

I had do the setting at the communication to reduce nothing when there is communication among others application.
But it seem like it didn't work.