'CCVolumeControl' Lets You Have Just a Standalone Volume Slider in Control Center
If you don't really use your iOS device to play music, and you've hidden your media controls from Control Center to reduce the clutter from the interface, but still want to have access to a volume slider in Control Center, then check out a new CCLoader add-on called CCVolumeControl
by iOS developer jaysan1292.
Shown above, this add-on lets you have your candy and eat it too. If you've hidden your media controls because it leaves such a big and bulky footprint in Control Center, you can use CCVolumeControl to have just a standalone volume slider in Control Center without all the media bells and whistles.
It's nice and simple, just like the display brightness slider.
Once installed, you can head to the CCLoader preferences pane in the Settings application and enable or disable the add-on on demand, as well as re-order it so that it shows up where you want it to:
If you want to give this free add-on a try, it's available in Cydia's ModMyi repository right now. Since the tweak relies on Control Center, it does require an iOS 7 device.
iPhone 5 running iOS 7.0.4