The number of unique stimului for this stimulus object

        :returns: int -- The expanded trace count

def traceCount(self):
        """The number of unique stimului for this stimulus object

        :returns: int -- The expanded trace count
        """
        nsegs = sum([len(track) for track in self._segments])
        if nsegs == 0:
            return 0
        ntraces = 1
        for irow in range(self._autoParams.nrows()):
            ntraces = ntraces*self._autoParams.numSteps(irow)
        return ntraces