I want to start playing with MIDI.  I have a soundcard which apparently
has not only a physical MIDI port but also a synth on it:

sb0 at isa0 port 0x220-0x237 irq 5 drq 1 drq2 5: dsp v4.12
audio0 at sb0: full duplex, mmap, independent
midi0 at sb0: SB MIDI UART
opl0 at sb0: model OPL3
midi1 at opl0: SB Yamaha OPL3

However, I can't find any description of any relevant APIs.  The
closest I find is in midi(4), which says

     The API for the sequencer device is binary compatible with the OSS se-
     quencer interface.

However, it fails to describe "the OSS sequencer interface".  It does
have a SEE ALSO for ossaudio(3), but that is singularly unhelpful:

DESCRIPTION
     The ossaudio library provides an emulation of the OSS (Linux) audio in-
     terface.

     Use the native interface for new programs and the emulation library only
     for porting programs.

What is "the native interface"?  I have no clue, nor any idea where to
find one...short of asking here. :-)

Any pointers would be most welcomed.

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