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Using Digi+ I/O as DSP Box

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?

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