he current version, only <TT>SND_OSSSEQ_MODE_SYNTH</TT> is used.
<P>The next two fields, <TT>addr</TT> and <TT>private_data</TT>, must be
filled by the synth driver at open callback. The <TT>addr</TT> contains
the address of ALSA sequencer port which is assigned to this device. If
the driver allocates memory for <TT>private_data</TT>, it must be released
in close callback by itself.
<P>The last field, <TT>event_passing</TT>, indicates how to translate note-on
/ off events. In <TT>PROCESS_EVENTS</TT> mode, t