i can do cat /dev/midi or cat /dev/midi00,
and characters are printed to the console every time i enter something on my midi keyboard.
however, applications from the ports tree (examples: pd, midimountain, rosegarden) fail to see/work with any of these midi devices.
another problem is that soundrecording apps also don't work with
the oss driver. they crash (audacity) or record silence (xwave).
i have tried setting the recording device in the applications to /dev/dsp1.
recording with ossrecord works, but there are skips in the recorded
cd-quality samples every now and then.
i tried this on a thinkpad 570e with cs4280 soundchip.
the native drivers work fine while not supporting midi.