well... i dont know if your laptop supports it, of if you would even want to purchase a sound card, but creative labs has an audigy 2 zs that works as an add-on card over pcmcia type II... so you can get the connections for multiple audio outs, and simulated multiple channel, all that stuff... thats better for gaming though than anything
PCMCIA is probobly the best but costly option. If you want to simply have sound in all 4 speakers get the splitter as advised above. That will do for music.
If you want surround sound that is correctly positioned in games and movies get extrenal soundcard. PCMCIA would be great but google for "USB sound card", too. There is plenty of them from Creative, Turtle Beach, M-Audio, Terratec etcetera...
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