Just started to use Raspyfi, with a Steelseries USB soundcard. That is the actual name, and it works like a charm
The soundcard came with my 5Hv2-USB headset.

Hardware volume mixer works, makes the sound louder cant say much about performance I've never been an audiophile.

For what its worth the dmesg output

[ 5709.885344] usb 1-1.3: New USB device found, idVendor=0d8c, idProduct=013c
[ 5709.907422] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 5709.927420] usb 1-1.3: Product: USB PnP Sound Device
[ 5709.935983] usb 1-1.3: Manufacturer: C-Media Electronics Inc.
[ 5710.050928] input: C-Media Electronics Inc. USB PnP Sound Device as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.3/input/input1
[ 5710.098105] hid-generic 0003:0D8C:013C.0002: input,hidraw0: USB HID v1.00 Device [C-Media Electronics Inc. USB PnP Sound Device ] on usb-bcm2708_usb-1.3/input3

and the lsusb

Bus 001 Device 005: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller