How to shut down computer and use vol up/down with ipac2?

[equlizer]

I see the website talks about it but no one shows how to do it

[Titchgamer]

Do you want to control system volume or MAME volume?
Mame volume is easy as you can set a shifted key for vol up & down then set those keys in the mame control set up.
The default for mame is the + & - keys.

System volume is a bit hardsr and depends on Windows version but you need to keyboard shortcuts and again set shift keys for most.

As for the power I assume you have already extended your pc power switch to your cabs exterior? If so just go to ure power management options and set it to shutdown pc on button press simples

[equlizer]

I want control of system volume and to power on the arcade with the ipac.  Their website says it can but doesn't explain how

[baritonomarchetto]

The system volume control is wery OS specific, so i would exclude that interface can do anything on this regard.
A different point would be control MAME volume...