[LAU] Command line to combine stereo WAV into 4-channel WAV?

[Eric Dantan Rzewnicki]

On Tue, Dec 01, 2009 at 10:21:16PM -0800, Ken Restivo wrote:
> Is there a bit of command-line-fu that could be used to combine two 2-channel WAV files into a single 4-channel WAV file? In batch (I have a bunch of these to convert).
> 
> I suppose I could load up Ardour, import the files into Ardour, make tracks for them, place them on the tracks, set my start and end markers, then export a mix.... btu there has to be a one-liner somewhere (sox? sndfile-convert? something?) that'll just do it.
> 
> Thanks.

ecasound can do that, too.

-edrz