Sound from an Arduino

I'm involved with this theate in my hometown, and I need to know if there would be a way to wire up or get something that will allow me to control an 8 chanel stero system via an arduino. If any body could give any suggestions or tell me what to do I would be much appreciated. You could respond directly to me, Thank you.

i think you need to give us some details about what it is you want to control, otherwise it's hard to give any advise.