Adds a new position marker: differently from the PositionMarkerAdd method, which requires a live recording session, this method can be invoked when the recording session has already been stopped.
Although there is no limit to the number of position markers that can be added to a recording session, only one position marker can be added on a specific position. It's not allowed adding a position marker at position 0 of the recording session.
The number of available position markers can be retrieved at the end of the recording session through the PositionMarkerCountGet method.
For details about recording from input devices see the How to perform a recording session tutorial.