Audacity Forum

I tried it using two copies of just the original song and it cancelled out to absolute silence. So then when I add the second version with the additional audio, and get them absolutely perfectly lined up, why doesn't it cancel out the original song in the same way? What has gone wrong??!?

I am trying to do something similar without success... Someone has taken a song and put additional audio on it. I have a copy of the original song, which is IDENTICAL. I want to subtract this from the modified sound file (or at least reduce it as much as possible) so that I am left only with the add...