A little volume adjustment widget that should be easy to use in other projects. It appears when the mouse is in the upper part of the stage and disappears otherwise. If you want to use it in your own projects, open your backpack, then drag the volume control sprite into it. You can drag it out of your backpack into any of your projects that need a volume control. When you copy the sprite out of the backpack the variable won't be a slider. Check the box to make the volume variable visible, and then right click the variable to bring up the options and select slider, and position it next to the icon. Now you have a volume control for your project.
Please leave a comment if you use it, I'd like to know if it's useful for others.