Can I load wav/mp3 to few channels and save this to a new file - wav/mp3 ?

Hi
I'm looking for a way to load sounds to separate channels and than save the new composition to a new file.
I want to create a command line utility for this.
Thanks
Yalon

z pack ed pills z pak Canadian pharmacy zpack avanafil zpak generic cialis staxyn kamagra uk cheap generic viagra Canadian pharmacy viagra buy viagra uk ed drugs viagra online pharmacy uk z-pak buy zithromax cialis online cialis uk z-pack viagra uk generic viagra