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How to close the sound of the application in win7

  
Many people like to listen to music or chat while working. At this time, if QQ appears, it will constantly remember the prompt tone, is it very annoying? Here Xiaobian will solve this problem for everyone.
Step method
Click the sound icon on the taskbar
Click on the "mixer" in the pop-up window.
The sound control of each application appears in the mixer window. As shown below:

If you want to turn off the QQ sound, just click the corresponding speaker under QQ.exe.

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