It don’t even have to get that complicated or have to implement a dedicated BUS system.
Once we decide to send the output of track 1 to 3+4 in the output section we should then be able to go to any other track and choose 3+4 as its input.
And to keep it simple we could restrict any track that is receiving routing, it’s output would be locked to output 1+2(main)
2 years on still waiting 