What should I do if a running program in the win7 Ultimate computer suddenly has no sound?

No matter which version of the computer we use, whether it is win7 64-bit flagship version, or win8 system, win10 system, we will not only run a single program when operating the computer, for example, we will run win7 Ultimate QQ in the computer, will open the browser, will open Word and so on, so in general, we are in the win7 Ultimate computer, the implementation of the multi-program operation. Today, there is a user who uses the win7 Ultimate computer to consult that a certain program running on his computer suddenly has no sound, so how to solve this problem?
Fault analysis: In fact, in our win7 Ultimate In the computer, there is a synthesizer adjustment function. This function is mainly to help the user to adjust the volume separately. If other sounds are normal, it is very likely that you accidentally turn off the volume of a certain game. This is The cause of a running program in the win7 Ultimate computer is not sound. Below, we specifically introduce the solution:
1. First, let's move the mouse to the notification area in the lower right corner of the win7 Ultimate computer, find the speaker icon, let's click the icon and select the synthesizer.
2. In the pop-up synthesizer window, we can see the separate volume control operation of the running program in the win7 Ultimate computer, we can adjust accordingly.