Each layer is using a different audio output.
Thanks to your reply, it un-mashed my brain to think through what you were suggesting.
I have managed to open different outputs on separate tracks, controlled via Midi on the “top” track. My setup is shown crudely below:
Viral Outbreak output 1 & 2 (track one) Midi control
Viral Outbreak output 3 & 4 (track two)
Viral Outbreak output 5 & 6 (track three)
Viral Outbreak output 7 & 8 (track four)
Thanks for this Druid. It certainly got me through to the solution.
=D>