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by jadamson 309 days ago
It doesn't mandate any of that, it's an optional feature.

The data pins are repurposed for analog audio, so it won't work with hubs. You'd of course need a DAC for output and an ADC for mic input, but the point is to replace a headset jack, so you'd have those already.

https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%... (PDF, page 309)