Hi, actucally you described a way of using it, but you´re not able to set the notes for triggering different instruments.
you could achieve this feature while using spark in "midi controller mode" but you always have to open up the midi control center, to change the note outs.
a solution for me would be: second vst (same engine when it comes to midi edeting; same GUI) but intended to controll third party plugins
after using the external midi vst, you just disconect and use spark 2 again, as like you are using two spark vsts in one project
I hope arturia will implement this, would be great!