TMR_ECHO 342 include/uapi/linux/soundcard.h #define SEQ_ECHO TMR_ECHO /* For synching programs with output */ TMR_ECHO 1242 include/uapi/linux/soundcard.h #define SEQ_ECHO_BACK(key) _TIMER_EVENT(TMR_ECHO, key) TMR_ECHO 226 sound/core/seq/oss/seq_oss_event.c case TMR_ECHO: