Hello, I think there is a bug in snd_seq_query_subscribe_get_time_real(). This function returns (info->flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP), but it should be (info->flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL), as it is in snd_seq_port_subscribe_get_time_real(). Regards, Erwin.