Buttons or Slider to adjust Windows 7 System Volume

En este foro podemos pedir peticiones de tutoriales o dudas que queramos.
Hi all
Do any of you have a tutorial or example, how to adjust system volume.
I want either buttons + and - or a slider to adjust windows 7 system volume.

e.g watching youtube videos with Google Chrome browser and be able to adjust the volume.
Thanks in advanced.
El volumen completo del sistema o solo de tu programa?
Thanks Dow Sher