Problems with Optical In sound on DAC+ DSP

I have a Raspberry Pi 4 with DAC+ DSP board attached. My end goal is to have a music player that takes an optical input or Airplay/other internal source input and plays it through the RCA output. (I've given up on having a video player.) I tried OSMC and Raspbian but struggled to get things working. (Not even knowing where to begin troubleshooting was a problem.) I installed HiFiBerryOS last week to simplify my setup and troubleshooting. 

My RPi4 is running HiFiBerryOS 20220228 and the DSP Program is DAC+ DSP Universal Version 12.

Optical Audio In is enabled and is detected as playing when there is actual input, but I can't get it to output. I have Auto-stop Other Sources turned on, Sensitivity is high. 

The Optical Audio In is coming from a Samsung TV as Dolby Digital. Speakers are set to Optical.

Airplay audio is correctly output via the Optical Out and RCA jacks.

When I connected via Optical In to a different Samsung TV with output coming from the RCA jacks into an AudioEngine N22 amplifier I got a flutter sound. Airplay sound via RCA output was fine when the Optical In was not connected. In my current setup, I have the optical out or RCA jacks connected to a Denon A/V receiver, Media Player input. (What happens if I connect both up at the same time? Does the receiver choose one?)

The output of aplay -l is as follows. The no sound checklist hasn't been helpful because I gather /boot/config.txt should be correct in HiFiBerryOS and is read-only anyway.

# aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 [HifiBerry DAC HiFi pcm5102a-hifi-0]

  Subdevices: 1/1

  Subdevice #0: subdevice #0

Can someone please point me in the right direction? I'm sure it is an obvious fix but I am stumped.




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