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The SoundControl module manages the settings of any audio mixers which are present in the system.
Most mixers operate by taking one or more input audio signals, mixing them together to produce a combined audio signal (with separate gain and mute settings for each input signal), and then distributing that signal to several outputs – again with separate gain and mute settings for each output.
SoundControl groups the input/output signals for each mixer into different categories. An index parameter is also used in order to cope with situations where a mixer has multiple signals which fall into the same category.