"MarkerTime" is Double type. It is time of Marker event. EmotivPRO will adjust the time for synchronization before injecting to data stream.
"MarkerValue" is value of Marker and it is Integer type. You can put Double type but EmotivPRO will extract integer part only before injecting to data stream.
"CurrentTime": is current Epoch time when the marker is pushed to LSL stream. The time is used to synchronize time between 2 machines