Windows OS has a new Volume Mixer feature & Volume Control options. The key improvements to this feature are better graphics displays & the ability to control the sound levels of all the applications which call for audio support from Windows 10/8/7.
Volume Mixer and Control in Windows
This new mixer effectively lets you control the volume for each application separately. To access it, click on the speaker icon situated on the right side of the taskbar.
Next click on Mixer to open the Volume Control window.
Here you can control the volume for you running applications which are currently calling for Windows Audio support. For instance, if you are listening to a YouTube video on in your Internet Explorer, you might want to soften the system sounds down a bit.
You can also control the overall level of sound on your PC. Move the sliders up or down to raise or lower the volume of your speakers, Windows sounds, or other sound devices or programs listed in the Volume Mixer. To mute the volume, click the Mute button.
Right-clicking the speaker icon, will give you more Volume Control options.
You might want to read about EarTrumpet Volume Control app too.