HELP: Adjusting/Controlling Attenuation (Volume) Level

sLapshock

I need help guys ...

How can i adjust the volume of the audio playout in real time?

For e.g

Left Channel    Right Channel
50%                   50%
30%                   30%
0%                     0%
30%                   0%
0%                    30%

i really need this program, good if there's an article of it or a source code or at least steps that where can i get this achive.

note that im using simple audio playout using directshow that make use of the Quartz.dll

thank you in advance