Sony Laptop: Fn keys won't adjust volume/brightness. How to fix?

Hello. I recently installed Arch linux with Xfce on my Sony VAIO VGN-SZ430N laptop, which has an Fn key that can be used in conjunction with the F keys (F1, F2, etc.) to complete tasks such as changing/muting the volume and adjusting the brightness. I would like to know if there is a simple way to assign the key combinations:
Fn + F2 Mutes
Fn + F3 Lowers Volume
Fn + F4 Raises Volume
Fn + F5 Lowers Brightness
Fn + F6 Raises Brightness
Those are the combinations I really use and need. How can I assign these tasks to the keyboard shortcuts specified above? Any help would be greatly appreciated.

Redrazor39 wrote:Alright. So what commands exactly would I run to get this software?
Constructive answer:
patroclo7 wrote:Look in the wiki for the many guides.
Did you try what the helpful man suggested?

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