At first, run the application and then choose among the options according to which the mouse wheel will control the volume.
Then it is necessary to press on the "OK" button in order the options to take effect.
Next times, the application will run minimize to the Window System tray and you can open the options window with a right click on the Volume Wheel icon and selecting open the menu or with a double click on the Volume Wheel icon in the system tray.
Control the Volume with the Mouse Wheel when :
Control + Shift Key is pressed
Control + Alt Key is pressed
Shift + Alt Key is pressed
Control Key is pressed
Shift Key is pressed
Alt Key is pressed
Custom Key Combination is pressed
Mouse is at the Edges of Screen
Mouse is at the Top, Bottom Edges of Screen
Mouse is at the Left, Right Edges of Screen
Mouse is at the Corners of Screen
Mouse is above Taskbar
Specific Program is focused
Specific Program is focused and Hot Key is pressed
For Specific Program and Hot Key is pressed
Mouse is over the Title Bar
Mouse is over the Title Bar, for Specific Program
Volume Bar Options
You can also show a volume bar when you control the volume
To specify its options and colors select "Options" from the "Options" menu.
Uncheck "Show Volume Bar" if you do not want to show it and press the "OK" button.