Right… so you’ll probably want to consolidate the functionality of both of your current racks into the one Post Rack. You can create additional input ports on the post rack for different output targets/routing if you need them.
I’m still thinking about the alias idea. For this to work seamlessly you’d also need the ability to automatically remove your old post processing racks from each song. I don’t really want to build UI for this and have to support it forever - maybe a batch update script might be easier.
eg: something like this that updates all songs in the current folder.
cantabile-batch-update --update-route-target "MyOutputRack|Audio In" "OutputPorts|PostRack: Audio In"
cantabile-batch-update --remove-rack "MyOutputRack.cantabilerack"