About Spector

Trying to make some leads in Spector,went to presets and found out that their lead is built using all 6 oscillators,but in LFO Mod Dest they use OscPitch 1,2 and 3,while only Osc1Pitch is possible to approach for users.Does anybody know how they approach to other Osc Pitches?How come there is just Osc1 in Mod Dest,when synth has six???Thanks.