Thanks for the confirmation of what I thought.
I was hoping for synths to be moveable, by the way, because I've recently picked up Catanya (which I'm liking), but I've determined it's better to have Catanya higher up in the synth rack order rather than lower. Rather than rebuild some songs with Catanya added in with the synth near the top, I was hoping to add it, and then drag it.
Instead I'm rebuilding, but that's okay, I don't mind that much.