Volume Help

I just need to raise the main volume level to the max in my project & then lower it after ir runs (It's an April Fools Joke that attemps to scare my coworkers) I have seen the other responses to volume control , it appears to be way overkill for this project. Please help ASAP April Fools day is monday.
TIA

I don't know how to work the volume control but here's something I did to a roommate once.

He kept buying toys for his computer but would never back anything up even though I kept warning him.

So one day when he was gone I wrote a batch file that basically flashed in big red letters

WARNING! WARNING! WARNING!
SYSTEM TERMINAL ERROR!
CLEANING SYSTEM!

THen it would create a temporary directory and copy every file on his system into it while it said it was deleting them.

Then it would delete the copies and still say "Deleting..."

In the mean time I unplugged his keyboard, so he couldn't stop it with a ctrl+c (dos years).

To make a long story longer, he soiled his drawers the next time he turned his computer on. No damage to anything but his cardio-vascular system and great laughs for me.

But I'm a jerk. Oh well.