+1 on this. Why do people work with music files in split LR? 
Have you tried: Project > Convert tracks > Mono to Multi-channel ?
I have a shortcut assigned for this and briefly tried it on a project while testing Nuendo.
+1 on this. Why do people work with music files in split LR?
Have you tried: Project > Convert tracks > Mono to Multi-channel ?
I have a shortcut assigned for this and briefly tried it on a project while testing Nuendo.