Provided by: oss4-base_4.2-build2010-5ubuntu4_amd64
mixer - Open Sound System mixer (control panel) device
Mixer devices are used by control panel and mixer programs (such as ossxmix(1)) to change volumes and other settings of the sound cards in the system.
See the OSS Mixer Programming section of the OSS Programmer's Guide (MIXER(2)) for more info.
/dev/mixer is the default mixer device file in the system.