cmix is a command-line style mixer program for Linux, designed to be intuitive and simple to learn and use. It facilitates modifying mixer settings from within shell scripts.
cmix is free software under the GPL.
Read the README for more info.
Current version is 1.6, April 8 2002.
Download from SourceForge: mix-1.6.tgz
cmix moved to SourceForge
SourceForge project page is here.