[LAU] tool to invert left channel and mix it to right

[Tommi Sakari Uimonen]

Hello!

What would be the command line magic to get stereo wav mixed to mono and 
left channel inverted before the mixdown?

Background:

I have recorded vocals with M-Audio Microtrack 24/96 (portable recorder) 
and I've used mic cable that has one xlr connector to the mic and two mono 
plugs to the recorder, which records stereo.

To get the final mono, I have to invert one of the channels and mix it 
with the other. This way all the errors on the signal get canceled.

I've done this with audacity, but it's rather lengthy operation if I have 
several files to convert.


Tommi