Has anyone here experienced a high-pitched noise when sampling by mic or line in? I have read one post where the user was advised to obtain a RMA and return to Polyend. Today however I have been told by Polyend that this is a bug that will be fixed in the next firmware update. Can anyone clarify if they experienced the bug and if so what they were told? Thanks
I had this happening. It turns out it only happened when my brightness was on medium, so try messing with your brightness. I have not noticed noise from the line-in - only the mic.
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NICE CATCH! 
I can confirm - when the Config for Display brightness is set to Medium, i also hear a high frequency hiss when using the Mic Input.
This does not happen when setting the brightness to Low or High.
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Thank you! Polyend have confirmed they are working on a fix.
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Hi @scottdowson , could you please confirm the nature of your problem? Does it also happen only with Mic input when screen is on Medium brightness? Or you experience it with other settings also? Thanks for your support and patience!
It makes high frequency noise by itself. Mine MK2 unit makes this noise only at medium screen brightness
There is a mk2?
If your unit is new (around 2021+), it is MK4
Just to prevent any confusion - this is about the Polyend Tracker Mini and not the OG Tracker and it’s revisions.
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Mine does the same , an internal component produces the high pitch noise and gets recorded by the mic… firmware is 2.0.
On a side note, I also identified an issue when recording and editing samples which then causes the other samples in the active pattern to be mangled (predominantly with the newly recorded sample) , might file a bug for that if I’m confident with the steps to reproduce the issue.
Check here:
This has been identified a while ago. Changing the screen brightness usually can solve that issue.
On my Mini for example if i have the screen brightness on Medium, i get the high pitched noise when sampling. Setting it to high or low solves it. For some it’s the other way around.
I have this same problem and it exists at all screen brightness settings.
I have created a wish that suggests disabling the screen backlight during recording (as a toggle feature for those that don’t want that to happen)
Just adding my experience here as well: my mini emits the high pitch noise from the device at all brightness settings but it is a bit quiter on high brightness, but still loud enough to spoil microphone recordings. With headphones on, I only hear the noise on the Sample Recorder page. It is loud enough that I thought my unit was broken until I found this thread. I can also hear it when recording via line in, but it is at a lower volume.
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I am wondering what’s the status is on this? Will it be fixed?
I should’ve been fixed with Tracker Mini Firmware 1.1
Hi @miropoly - I unfortunately have this with 1.1, but I also have it with the latest beta 2.1.0 b1 1153. Also on all three brightness settings. Perhaps I am doing something wrong. I did mute the mic/line input, but that isn’t causing it I think. Could it be the display itself?
Hi @solidtrax.nl , sorry you’re still having issues. It could be different causes, both hardware and software. Please send us a recording of the noise to investigate. Thank you
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I must admit that my Pixel phones mic isn’t as sensitive as my ear - at least I think of it this way 
But you can hear the high pitched noise especially around 42 and 56 seconds. Could this be wifi signals being picked up or something?
It could also help to open the mp4 and up the gain of the audio by quite a bit.
Just for info, its the same with the Tracker+ (and was it also on the PT OG?).
When you set brightness to low and turn on input monitoring, even when not in the sample recorder, you hear a background hum with headphones.
Perhaps screen is dimmed via pwm and it bleeds into the audio circuit, just my humble assumption, i know not enough about this circuits 
Its not a dealbreaker as long as you set the brightness to high.
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Many thanks for your quick reply @Patrick
I hear this from the screen (or behind it) - it’s not in the audio path as far as I know, but if you were to record a sample it would be in the audio path. And if you like to work at night - when it’s quiet - it’s a bit of a pain to be honest.