Kernel 2.6, GNU (Slackware 12.0).
bash-3.1# file receive48.wav
receive48.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 48000 Hz
This file, I intend to make it mono. That is, to mix both channels. I know this is a piece of cake for sox. But exactly how do I do it?