Using DAC+DSP to build a standalone DAC with Room Correction

I'd like to use a Raspberry Pi between my Chromecast Audio's TOSLINK output and my amplifier's RCA input - to function as DAC and simultaneously apply Digital Room Correction using the DSP.
(So:  Chromecast TOSLINK output -> Hifiberry DAC+DSP TOSLINK input -> Apply DRC -> output to Hifiberry RCA -> Amplifier RCA Input)

How do I set up the Raspberry Pi + Hifiberry DAC+DSP to continuously get input from TOSLINK IN, and output to RCA out?

(Once that's working I should be able to figure out myself how to apply the DRC in between)


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