Replace single icon in Unity-Icon-Theme

[devrat43]

I use the Unity-Icon-Theme but the icon for increasing/decreasing the sound is really bad. I like the simple black and white one in the default Gnome icon theme.

Is there a way I can change the Volume Increase/Decrease icon in Unity-Icon-Theme with the one in the Gnome icon theme?

We have four files in the following address :
/usr/share/icons/gnome/scalable/status

Namely,
1.audio-volume-high-symbolic.svg
2.audio-volume-med-symbolic.svg
3.audio-volume-low-symbolic.svg
4.audio-volume-muted-symbolic.svg

I wish to use these in the Unity-Icon-Theme.

[devrat43]

Solved it.
Make a folder in the "Unity-Icon-Theme" and put the desired files there. Edit the index.theme file and add the directory and a few more lines to it.