Microphone level increased automatically during recording

I have an external USB microphone. Trying to record a music with mic level set to 0.1 in Audacity, but after making first notes mic level starting to slide up till it reach the maximum level.
I switched off “Allow application to take exclusive control…” option as it is advised in some similar topics, disabled “AGC” option as well. Nothing helps.
Did not find any other enhancement options anywhere in settings.

What also can lead this behaviour?

What version of Audacity? See the pink panel at the top of the page.

Did this computer come with Windows 10, or did you upgrade it over older Windows?

What is the exact make and model number of the USB mic?

Is the Audacity recording level slider moving rightwards when the problem happens?

Are you recording overdubs against playback of a track in Audacity? If so, is the problem ever that the music background becomes quieter? You could try right-click over the speaker icon by the system clock, then choose “Sounds”. Click the main “Communications” tab, then under “When Windows detects communications activity:”, choose “Do nothing”.


Audacity 2.1.2
Windows 10.0.14393 Build 14393 - hope W10 was the original version on the laptop, but not absolutely sure how a seller installed OS on it.
Tonor Condenser Microphone - https://www.amazon.de/gp/product/B01IK8H286

Yes, slider moving rightwards increasing mic level when I make a quiet note, if I play extremely loud it doesn’t happen.
Yes, I recording overdubs against playback of a track in Audacity using headphones. No, backing track volume is not changed during the recording.
Enabling “Do nothing” option does not help.

Thanks for your help!

I’ve just found the reason.
I’m using an online tuner to control a notes pitch, of course this web page is allowed to use a microphone.
When I closed the browser tab with tuner problem disappeared.

You prompted me to search other reasons than the Audacity and system settings.
Thanks a lot!

Thanks for letting us know. The behaviour is abnormal so it had to be interference by some other application. My next suggestion would have been to turn off Skype or other VoIP application if you had it.

I noticed in these Amazon Buyer Questions that, unsurprisingly, there are complaints the volume is too low, given it’s a condenser mic but there is no pre-amp. Perhaps the AGC compensates sufficiently for that, but could make it noisy.