Open Sound System
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This capability is an alias of (MIDI_CAP_INPUT|MIDI_CAP_OUTPUT). It must not be used in applications. Instead applications should check the MIDI_CAP_INPUT and MIDI_CAP_OUTPUT capabilities separately.
In earlier OSS versions all MIDI devices have been input/output ones. However the future direction will be splitting such "duplex" MIDI ports to separate input and output devices.
MIDI device capabilities like MIDI_CAP_INOUT can be checked using the SNDCTL_MIDIINFO ioctl call.