This is a good thread on making drones on the Octatrack:
http://www.elektron-users.com/index.php?option=com_fireboard&Itemid=28&func=view&id=163488&catid=9I am using some of the techniques in that thread to make drones using the sampling and effects features of the Octatrack.
If, however, by "trigger drone" you mean triggering an external synth via MIDI from the Octatrack sequencer, you might want to post more details about what you are trying to do and what the issue is.