As there is not even a block diagram published, I don't know the answer, but ideally one would not want baseband analogue audio anywhere in the path, so one would not want a sound card, integrated or not, but rather direct access to a digital feed from the DSP.

On 04/10/2020 20:07, Terry Brown wrote:
I assume the K4 has an internal sound card to take the place of the signalink

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