Hi Brain,
Have you tried using Direct Routing in N6. I started using them in N5 and couldn’t live without them. Basically, you can route a channel to multiple destinations (and also export those destinations to disk - very cool and handy for mixing multiple stems at once) and therefor mute a channel that is being sent to your multitrack and also have it routed to a channel that you are monitoring.
I hope I understood your question and I hope this helps.
Cheers,
Andrew K