CE</TT> and a capability-bit <TT>CAP_READ</TT> or
<TT>CAP_WRITE</TT>. Also, subscription capabilities, <TT>CAP_SUBS_READ</TT> or <TT>CAP_SUBS_WRITE</TT>,
must be defined, too. If these conditions are not satisfied, the port is not
registered as OSS sequencer MIDI device.
<P>The events via MIDI devices are parsed in OSS sequencer and converted
to the corresponding ALSA sequencer events. The input from MIDI sequencer
is also converted to MIDI byte events by OSS sequencer. This works just
a reverse way of seq_