DSP Robotics Support

I'm trying to get two voices that are panning randomly and independent from each other but somehow it still sounds like a single instrument instead of two. Do I need to add de-tuning ? Delay ? Phase shifting ? Or filtering on each one ? Or how do I make it sound like multiple independent instances ? I want to make it sound like two or three instruments positioned in space differently.

It looks like it's not working in FL Studio because it's not receiving any notes from the piano-roll or it's blocking all the notes. From the PC Keyboard it only works inside FS but not in FL.