SOUND_PCM_WRITE_CHANNELS
err = ioctl(pbe->fd, SOUND_PCM_WRITE_CHANNELS, &temp);
args->cmd = SOUND_PCM_WRITE_CHANNELS;
case SOUND_PCM_WRITE_CHANNELS:
#define SNDCTL_DSP_CHANNELS SOUND_PCM_WRITE_CHANNELS
if (ioctl(f, SOUND_PCM_WRITE_CHANNELS, &c) != 0)
case SOUND_PCM_WRITE_CHANNELS: