MIDI is just data (note on, note off, velocity, control this that way, control that this way). Not actual audio. MIDI CC10 is reserved (in the MIDI spec) for pan, and if you put each MIDI note on a different channel you could have a different CC10 value on each of the 16 channels. Studio One would already support this. However, if you don't have that MIDI output connected to an instrument that responds to those per-channel pan controls (and I don't know of any that do - from any company) then it's not going to make a difference. Some synthesizers allow per voice panning, but that's being controlled by the synthesizer itself and not the incoming MIDI.