Checked it out ! They are using very old versions of linux and buildroot.
This worked for me :
with suitable settings for network/interfaces and wpa_supplicant.conf
The Ultra sound card - Live now on kickstarter : https://goo.gl/8HdqDi
Sound card for the Raspberry Pi with inbuilt microphone : http://www.audioinjector.net
Audio Inector Octo multitrack GPIO sound card : http://www.audioinjector.net