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Possible way for sound card
https://www.google.com/search?q=usb+sound+card&source=lnms&tbm=isch&sa=X&ei=_KazU4m0EoWrPMymgPAG&ved=0CAkQ_AUoAg
Connect directly an USB sound card, and/or use it and solder it -
Possible way to improve USB port and more with the Rpi evolution
http://www.raspberrypi.org/introducing-raspberry-pi-model-b-plus/