2 volumes controll

I added my first sound to a aready actionscript that control the valume. and its work OK

Now I need to add one more sound.
How do I add and defind more sounds at the variable and value. (using the attached sound way).
What I need is one volume controller that controls more than one sound.

It may seem slightly strane (or it did to me anyway) that when you work with the sound object if you do something like

music = new Sound();
music.attachSound("linkage_id1");
music.start(0,999);

effect = new Sound();
effect.attachSound("linkage_id2");
effect.start(0,999);

doing

music.setVolume(40);
will set the volume of both sounds to 40 to have the volume work separately on sounds they need to be created in different clips with something like music = new Sound(this);

Thanks, its work (and now looks very simple..)