somebodyelse
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That seems to be the case, and does seem a bit unusual. I think it's down to the limited i2s available on the ADAU1701 which as I understand it is one port that can be used for input or output but not both. They used that for the headphone output DAC so had to do something else for the USB input. I would have preferred not to have the headphone out, and to keep the USB input digital all the way. Or use a more capable DSP and give it a sub out too - currently there's no way to add a sub with the USB input.