AUDIO_UNIT
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));
sc = (struct audio_softc *)device_lookup(&audio_cd, AUDIO_UNIT(dev));