we don’t know what you will do with the audio once it is inside the Pi. However, the Wolfson board with its Line In and S/PDIF makes it possible to get sound into the Pi. We know the plugin „WaveInput“ available for Squeezebox Server (LMS). In the plugin’s settings, you can choose the correct audio input there. The LMS can provide the incoming audio to all clients as usual.
Make sure to use the Raspberry Pi Default Image and choose „Wolfson ´Cirrus Logic (Kernelchange) at „Raspberry Settings“.
Maximilian from Max2Play