Tracker Mini high-pitched noise when sampling

Ah, okay. Tracker + has no internal mic, so its not in the sample recording.

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Here is a quick n dirty recording. It may be not the same noise as you experienced. Just to proof the point, the noise floor changes with the screen brightness.
Test settings: master vol max 12db
Input mic hg gain at -inf, to not have additional noisefloor from line input.
headphones, power source doesnt matter, powerbank may be cleaner than a wall wart.

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And how i experienced this few days ago:
Had set the input to line in, monitoring on and line in unmuted in the mixer. Late night in the studio, brightness to low, constant hum on the headphones. Wondered where the hack a ground hum is coming from😄 until i remembered, there was a screen brightness thing…
So, conclusion with inputs enabled, set the brightness to high.

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Ok thanks @Patrick seems like something to check as well tonight. Again, thank you for your time and making this video! Appreciate it a lot!

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Hi @solidtrax.nl , I’m sorry but I cannot hear anything in the recording you sent. There is nothing connected to your Mini, so I’m not sure what noise you’re referring to? Sorry if I missed something.