gcscaudio_append_formats
static int gcscaudio_append_formats(struct gcscaudio_softc *,
gcscaudio_append_formats(sc, &gcscaudio_formats_2ch);
gcscaudio_append_formats(sc, &gcscaudio_formats_4ch);
gcscaudio_append_formats(sc, &gcscaudio_formats_6ch);