snd_emux_lock_voice
void snd_emux_lock_voice(struct snd_emux *emu, int voice);
snd_emux_lock_voice(emu->emu, i);
snd_emux_lock_voice(emu->emu, 0);
snd_emux_lock_voice(emu->emu, 1);
snd_emux_lock_voice(emu->emu, i);
EXPORT_SYMBOL(snd_emux_lock_voice);