This VI will add the value of add step to the data in the selected pulses. Selection of the timing or the waveform is done by setting the desired index through timing/waveform, 0 for the timing or the index corresponding to the waveform in the 2D data array. index selection is an array containing the indices of the pulses you which to alter. The option `symmetric' adding? controls how the addition is done. If it is set to true , the VI will first check the value at the index, if that is negative the step value will be subtracted if positive it will be added. If you set this option to false the value is simply added. scaled data returns the modified 2D data array.