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I just got a Lexicon Alpha usb audio interface, but it's not showing up as a usb device or as a sound card.

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Please add a tiny bit more detail to your question: what Ubuntu release are you using, how do you know it is not being detected by the system? Can you give us some logs? – Bruno Pereira Oct 3 '12 at 19:38
My Lexicon shows up as just "Digitech" under lsusb and has more correct info in the listing from usb-devices. However, it does not appear to show up when running sudo lshw in the terminal. It also shows up in System Settings->Sound, and in pavucontrol, as well as being usable by JACK. – dobey Oct 3 '12 at 19:54
[solved] I removed pluseaudio and used the alsa hw:2,0 ; works great now. Sorry for leaving the question open. – Syborgia Alphas Mar 13 '14 at 22:48
BTW - for musicians, (from what I've read and tried) it's best if pulseaudio is removed. – Syborgia Alphas Mar 13 '14 at 22:49

Try unplugging the USB cable and plugging it back in. This might trigger detection.

I have Lexicon Alpha with Kubuntu system (and Win7 dual boot). Linux and Windows does not detect the stupid sound card on login, I must manually unplug the USB cable and plug it again to detect the card, everytime!

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for some reason it battles with the primary sound card for hw:0,0 when you boot. Unplugging at every shutdown/restart and plugging in after reboot (after everything loads) is a must. – Syborgia Alphas Mar 13 '14 at 22:52

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