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In addition to the "real" hardware devices OSS supports also virtual devices such as the Virtual Mixer and IMIX drivers. Such devices may or may not be connected to some real devices.
Checking for this capability may be usefull in some utilities. However ordinary applications should not care about of it.
Mixer device capabilities like MIXER_CAP_VIRTUAL can be checked using the SNDCTL_MIXERINFO ioctl call.