CM_OPEN_DAC
if (! (mode & CM_OPEN_DAC)) {
#define CM_OPEN_PLAYBACK (CM_CH_PLAY | CM_OPEN_DAC)
#define CM_OPEN_PLAYBACK2 (CM_CH_CAPT | CM_OPEN_DAC)
#define CM_OPEN_PLAYBACK_MULTI (CM_CH_PLAY | CM_OPEN_DAC | CM_OPEN_MCHAN)
#define CM_OPEN_SPDIF_PLAYBACK (CM_CH_PLAY | CM_OPEN_DAC | CM_OPEN_SPDIF)