Dave Smith Instruments SYNTHESIZERS

I have a PEK and have one sequencer going triggering 1 of 4  voices---i have the volumes maxed out and it seemed  quiet so i wanted to go unison with the sequence for a bigger sound.. so i set the selector for either of the unisons and  it still only plays the sequence with one voice... i can play other voices on top of it ('keyboard and sequencer' setting ) but i cant seem to get the sequencer alone to play in a big unison. No matter what i tried, the sequencer only fires one voice. I even tried programming 2 of the sequencers for the same pattern and sound , but still only one voice fires.  Maybe im missing something? I would like to see a unison/4 voice sequence. (its a simple rhythmic loop  playing a couple diffrent notes) I may be doing something wrong.