Open Sound System
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The MIDI mixer device can be used by MIDI sequencer programs to control OSS mixer devices (volumes) in real time. A list of mixer devices available in the system can be found using the ossinfo program with the -x option.
This driver uses MIDI channel numbers to select the mixer device. The first MIDI channel (#0) connects to the first mixer device in the system and so on. When any of the mixer controls (such as volume sliders) change their value the MIDI mixer device delivers a control change message to the application listening it. An application (such as a MIDI sequencer program) can record these mixer changes during recording and play them back during playback. In this way it's possible to repeat mixer changes with precise timing during playback.