Open Sound System
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This capability is used both with internal and external MIDI device files when it's known that the port is connected directly to given device (keyboard or sound generator). When this capability is set the name field returned by SNDCTL_MIDIINFO contains the name of that device instead of the name of some generic MIDI port.
MIDI device capabilities like MIDI_CAP_PTOP can be checked using the SNDCTL_MIDIINFO ioctl call.