Mr.T wrote:
wrote in message
oups.com...

What program will add them?


What one won't?
You need to import 2 mono files into a new stereo file, invert one channel,
then add the channels to make a mono file.
(Obviously the files also need to be time aligned)

I use Goldwave as it's free.
Load 2 stereo files, invert one, copy it and mix it into the other. All in stereo.
You should also tweak the volume of one file, in fractions of a decibel,
to get the minimum signal, as the level may have changed between your two
measurement points.

If there is a high-frequency roll off on the noisy signal, you really should
match it by lowpass filtering the clean wav file to match.

--
Eiron

No good deed ever goes unpunished.