As far as I understand you need to make sure you feed it 352.8/384 khz samplerate material as this is the base rate of the 2 DAC chips. With the setting enable, the DAC chips do not internally upsample anymore.
You could activate Volumio’s resampling to first upsample before outputting it.
Not sure which resampler Volumio uses but their are some ideas that certain software based upsamplers can do it better than the hardware of the DAC.
But I could be totally wrong here…
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