Adjusting the audio volume via applescript can be very useful. Here’s how to raise the volume on your system 10 notches (out of 100):

 -- volume up 10
 set current_volume to output volume of (get volume settings)

 if current_volume is less than 100 then
 	set current_volume to current_volume + 10
 end if

 set volume output volume current_volume

If you are using a using a keyboard that isn’t designed for the Mac and doesn’t have functioning multimedia controls, variations of this script can come in handy when assigned to keyboard shortcuts.