snd_ymfpci_voice_free
snd_ymfpci_voice_free(ypcm->chip, ypcm->voices[1]);
snd_ymfpci_voice_free(ypcm->chip, ypcm->voices[0]);
snd_ymfpci_voice_free(chip, ypcm->voices[1]);
snd_ymfpci_voice_free(chip, ypcm->voices[0]);