Hi,
I'm very much a noob with RPi and Linux, but I've managed to get Raspbian installed and audio to play through the optical output on the Digi+ I/O.
What I'd like to do is read audio through the digital input, process it with an FIR filter, then output the result, so that the RPi becomes something of a DSP device that sits between source and DAC.
Could anyone point me in the right direction?