Hi @stubaggs — Thank you for the report and sharing this observation you have made with us. The insight is very appreciated!
Moving forward, to help aide in our evaluation of this behavior you are experiencing with the mentioned endpoint (i.e QB9 + RPi) may I very kindly ask you to please provide me with the following information:
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Please expand on the description of your setup by using this link as a guide.
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During your troubleshooting of this behavior have you tested with another DAC connected to the RPi to verify what the experience is like.
-Eric