[all variants] External Soundcard fully working with Ubuntu

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http://ubuntuforums.org – Hi! After upgrading ubuntu 9.04 to 9.10, pulseaudio says that my Toshiba Multimedia Center soundcard is 4.0, but this is fake, because it's 5.1 surround sound card. I'm tired by searching for good pulseaudio/alsa config, so I'm looking for external sound card fully working with Ubuntu. My preferences: * USB or ExpressCard interface * full support in ubuntu * 5.1 or 7.1 surround sound I found Creative Extigy and Creative USB Sound Blaster X-Fi Surround 5.1, but I'm not sure that those cards will work fine. What do you recommend? (Hardware)