Hi, I've a small shop with four speakers dotted around for sound played via my office computer. The current system is a bit flaky and needs replacing. I was wonder if such a thing exists that I can use a 5.1 system to put out sound to 4 speakers, and each speaker would have a volume control and be playing the same thing, ie the music and not surround sounds - if you know what I mean. Or is there a better way to do this? It must originate from my computer as I use mp3s (don't worry, the PRS are fully paid

) for the music.
I hope for a few suggestions as I ned to try and sorty this to add some atmosphere to my shop.
Thank you for any advice