Hey Fwenk, welcome to Elektronauts and sorry to hear of the Rytm sampling issues.
Can you give us a little more info about what your setup looks like on the Rytm? When you go into the sampling page, what settings do you have selected? Maybe it would help to just focus on one input source, either the audio inputs or USB, so we can figure out what’s going on and how to fix it.
If you can take pictures of the screen or even a video of the problem, that kind of stuff is also super helpful to help show others what’s going on.
Since you’re getting harsh white noise, it sounds like you’re recording silence and the Rytm is normalizing that silence up to audible levels, hence you just hearing a loud noise sound. So maybe check the input source to make sure you’ve got the right one selected, and check the meter to make sure your signal is coming in at the right level. Those are just some basic ideas but if you share some more info about what’s going on, maybe one of us around here can help.