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DIGI2 PRO V2.2 aliasing

HiFiBerryOS 20230404, Digi2 Pro + DSP, Pi 4 Rev. 1.4 (out of the box, no changes -- just loaded OS on the SD, plugged in hardware and booted).

SPDIF output to Topping E50 DAC, locks properly at 96KHz with Digi2 Pro.

Measurement at DAC output of 19KHz test signal generated using the Sox command: play -r 96000 -n synth sine 19000 vol -6db

Why am I getting this aliasing?  When I move the SPDIF cable to my computer SPDIF output (with DAC again locking at 96KHz), I get the expected output:

Thanks for any help you can provide!

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