SNDRV_SEQ_TIME_MODE_ABS
#define snd_seq_ev_is_abstime(ev) (snd_seq_ev_timemode_type(ev) == SNDRV_SEQ_TIME_MODE_ABS)
cell->event.flags |= SNDRV_SEQ_TIME_MODE_ABS;
sev.flags = SNDRV_SEQ_TIME_STAMP_TICK|SNDRV_SEQ_TIME_MODE_ABS;