If you want to set individual volume levels for each app in iOS 9 and your iDevice is jailbroken, then you should try a new jailbreak tweak known as VolumePanel. There are many reasons why being able to configure the volume level on a per-app basis could be useful for every iDevice user. So follow the guide below to see how this tweak works.
How To Enable Individual Volume Levels For Each App On iOS 9 iPhone
Step 1. In order to set individual volume levels for each app in iOS 9 you must jailbreak your device. Currently there is only one Pangu jailbreak tool to liberate your iOS 9 - 9.1 device.
Step 2. But if you are already jailbroken you can head to Cydia and download the VolumePanel for $1.49.
Step 3. Once installed the tweak will add a preferences pane to the Settings app that allows you to configure the VolumePanel tweak to your liking. Here you can enable or disable the tweak on demand, choose the location of the app volume level toggle button in Control Center, pick an Activation Method to launch the standalone VolumePanel interface and more. You can also respring your iOS 9 device from here to save the changes that were made to the Settings.
VolumePanel tweak is used one of two ways. The first is that you can set up an Activator action that allows you to invoke the interface at any time.
The second method is via the button that is added to the top left of the media controls in iOS’ Control Center on your jailbroken device. Here you can click on the VolumePanel button to hide and show the volume controls for each app on your device. You can easily change the volume levels of individual apps by tapping and dragging on the knobs. You can even scroll left and right between the knobs to move through all of the individual apps the tweak recognizes on your device and set independent volume levels for them.
VolumePanel looks to be a solid tweak to have on your jailbroken device that supports both iOS 8 and iOS 9 firmware versions.