I received the Turtle Beach USB Amigo II today and it's working brilliantly.
It took my a few minutes to get it to work with XBMC (Live) on a Zotac Zbox ND02.
I only found success once my Audio Output settings were configured as follows:
[quote]Audio Output: Optical/Coax
Speaker configuration: 2.0
Boost volume level on downmix: yes
Dolby digital ac3 capable receiver: no
DTS capable receiver: no
Audio output device: USB sound device iec958
Passthrough output device: USB sound device iec958.[/quote]
Hope this helps somebody one day.