An in-ear monitor system has earpieces with haptic metronome actuators. Synchronized metronome vibration pulses, which pose no audible interference to audio monitoring, stimulate the user's ear and or ear canal. A sound engineer or technician from a control console selects or programs the synchronized metronome timing sequence and the sequence is multicast to one or more receiver body packs worn by the performer in the group. The timing sequence can alternatively be selected in response to audio commands spoken by a user wearing the in-ear monitor, or can be based on a beat sensor.