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    I did solve it actually, sorry I forgot to reply....

    I did solve it actually, sorry I forgot to reply. Paul was right, it was entirely a grounding thing. In my case I solved the issue by making sure I was using the ground connections on the audio board...
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    Didn't know that was an option, I'll give it a...

    Didn't know that was an option, I'll give it a try.



    I'm pretty sure I remember this happening while running from a battery, from a phone as a source of audio, to headphones! That said I don't...
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    Just posting here to say I've had this same...

    Just posting here to say I've had this same constant volume 344hz noise when using the audio adapter, but only when powering the Teensy from the Vin pin. All pins are soldered through to the Teensy...
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