Someone more knowledgeable should tackle this to confirm, but I doubt that model Sigmatel's getting a sound driver.
*gets an idea*
Try looking for "AzaliaAudio.kext". That might get your sound working if there's no specific driver for your sound.
Now about that internet...got money for a USB dongle? It's probably your only choice.

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Custom Hackintosh...AMD Athlon X2 5000+ (2.6 GHz) on GA-MA78GM-S2H...Linksys WMP300n Wireless...ALC889a sound...ATI HD 3650 PCIe...1 GB DDR2 RAM...320GB Western Digital SATA + 200GB Seagate IDE HDD...Rosewill DVD-RW IDE...Running Kalyway upgraded to 10.5.7...All Fully Functional