Can Volume Keys Control ALL Volume?

[Gorinstarborn]

I'd like to know if there's a way to make the volume keys on the side of the phone control all 4 volumes at once. Either through the system on the phone itself or through a third party app.

Currently it seems you can only toggle between "Ringtone, Notifications & System" OR "Media" and then whichever one you don't have selected has to be set with the touchscreen control. I would very much like to be able to control "Ringtone, Notifications, System & Media" all at once with the side volume keys.

I have tried googling, but Google is doing it's, "Here's what you aren't looking for." thing. (I type, "control all volume with volume keys android" and it gives me a bunch of tutorials on how to switch between media and everything else. Not helpful.)

If it's something you can't change then whatever I guess, but it would be awesome if someone knows a way.

 

[Dannydet]

I use this
https://play.google.com/store/apps/details?id=alirak94.gmail.com.volumecontrols
But I don't know of 1 that does all 4 as 1 slider