removing *really* bad hum

Special Interest Groups Recording Techniques
3

Here’s the plug-in that I used (it’s not on the Audacity wiki yet, but will be)
de-hum.ny (2.11 KB)
Installation instructions: http://wiki.audacityteam.org/wiki/Download_Nyquist_Plug-ins#install

Settings that I used: Europe 50 Hz, 8, 8, 35