New answers tagged volume-control
A root tweak is one option but if you don't want to do this, SoundHUD (avaliable here) will bring more traditional volume controls back to Lollipop. The app has lots of configuration options too.
The feature you have requested (Expandable Volume Control) is present in GravityBox (Lollipop). You can find it at the Xposed Repository . You can download it directly here (3.54 MB). However, do note that the Xposed Framework is still in Alpha, so some features of the module might not work properly. If you find any, do report them at the official XDA ...
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