Gnome Shell Extension to change audio volume by scrolling through the top panel.
Works on Gnome 3.22.3. Haven't checked for older or newer versions.
Settings menu supporting custom volume step and option to use boost volume (150%).
This is a fork of Workspace Scroll (https://github.com/squgeim/Workspace-Scroll.git) and GNOME Shell Volume Mixer (https://github.com/aleho/gnome-shell-volume-mixer.git). Thank you.