emu_vinit
r = (emu_vinit(sc, ch->master, ch->slave, sc->bufsz, ch->buffer))
r = (emu_vinit(sc->card, ch->master, ch->slave, EMU_PLAY_BUFSZ, ch->buffer)) ? NULL : ch;
int emu_vinit(struct emu_sc_info *sc, struct emu_voice *m, struct emu_voice *s,