How to Set different Sound Levels for each Android Application Separately.
The app I am talking about is App Volume Control, a very simple app for Android phones that allows you to change the volume levels for each Android app installed on your device. You can set a volume level when playing a video on YouTube or listening to music from the music app or playing games. You can also set the sound of notifications and alerts for this app, not just media, and control the volume when using earphones or Bluetooth. In general, you can download and use the app easily without the need for root access like other similar apps.
( Download the app )
After installing and launching the app on your phone, just press the settings icon located on the top of the app to move to the accessibility settings to allow this app the permission to control applications. Look for the Services section, click on App Volume Control Service underneath, then activate the app from the button at the top corner of the screen. A confirmation message will pop up, so press OK, and then click the back button.
Next, you will see a list of all the apps installed on your phone, including the basic ones. All apps will be listed in one menu. Simply select the app you want to adjust the volume for, enter it, and you will find options to control the sound emitted by the app when receiving notifications, alerts, or just general sound after launching it. You can adjust the volume level as you wish. You can even control the volume when using headphones by clicking On Headset and adjusting the volume level.