saffire 6 usb on ubuntu?

[Stefan Thomas <kontrapunktstefan@xxxxxxxxxxxxxx>]

Dear community,
 I've borrowed now a saffire 7 usb focusrite and I'm trying it on Ubuntu 0412
The card is recognized.
After 
> cat /proc/asound/cards
I get
> 0 [Intel          ]: HDA-Intel - HDA Intel
>                       HDA Intel at 0xea200000 irq 55
>  1 [UM1            ]: USB-Audio - UM-1
>                       EDIROL UM-1 at usb-0000:05:00.0-1.1, full speed
>  2 [NVidia         ]: HDA-Intel - HDA NVidia
>                       HDA NVidia at 0xe3080000 irq 17
>  3 [S6USB20        ]: USB-Audio - Saffire 6USB2.0
>                       Focusrite Saffire 6USB2.0 at usb-0000:05:00.0-2, high speed
But I can't get sound out of it. I tried it with 
mplayer -ao alsa:device=hw=S6USB20 myfile.mp3
but I got 
> Failed to initialize audio driver 'alsa:device=hw=S6USB20'
Also I can't find an interface called usb or saffire in qjackctl. What can I do now?

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