The plug-in is called FFT Tools from Smart Electronix. No matter how hard I tried their official site does not open. I couldn’t find this plugin on the Internet either. This plugin includes Kontrast, which is exactly what I need. Does anyone have this plugin in .dll format? Please share it.
The FFT Tools plug-in is available from Wayback Machine
Note that this is an ancient 32-bit plug-in. It will not work in 64-bit Audacity, and there is no guarantee that it will work in any version of Audacity.
Yes they are, I just downloaded them, they didn’t work. I need the 64 bit version.
Smartelecronix shut its doors years ago, so there won’t be any updates.
There is no 64 bit version. The 32-bit plugins will run on 32-bit version of Audacity.

You have to be careful having 32-bit and 64-bit version of Audacity on the same machine:
you have to keep them separate: a portable settings folder for each version.
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