Open Sound System
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Simple mixer applets may use this flag to find out the mixer widgets that control volumes of an input signal that is routed directly to the output of the mixer.
The MIXF_MONVOL flag was added to OSS 4.0 in build 1008 and to OSS 4.1-test tree in October 2007. For this reason it's necessary to use #ifdef MIXF_MONVOL/#endif in the code that uses this flag.