I’ve got two clips of the same audio that are both noisy (it’s from two different versions of a trailer) and I want to pull a clip of a guy talking on a radio out of them. I can’t use noise reduction because then it takes out half the sound of the radio, but since I have two clips can I somehow tell Audacity “find the parts of these two clips that are the same, then remove everything else”?
Try a graphic equaliser (or similar EQ) and drop all the low frequencies below 100Hz and high frequencies above 15kHz, may help if noise isn't too bad.
Could try inverting one recording and mixing with the other recording, that would cancel out any similar sounds and leave only the noise. Then, Invert the noise recording and mix it with original to cancel out noise - very fiddly and may take a lot of trial and error