Function Set_Audio ($volume){
If(-not([bool]!($Volume%2))){$Volume = $volume + 1}
$volume = $volume / 2
$wshShell = new-object -com wscript.shell;1..50 | % {$wshShell.SendKeys([char]174)};1..$Volume | % {$wshShell.SendKeys([char]175)}
$wshShell.SendKeys([char]173)
}

# Use like this.
Set_Audio -Volume 100
Set_Audio -Volume 50