Help with Multi-Track Quicktime Audio Assignment

Hey everyone! I've scoured the internet for an answer to this question on current software and haven't found it so I'm really hoping i can get an answer here.

I work for a church that for years has utilized multi-track quicktime videos to play back audio in some of our services where we don't have a band and technician to place lyrics on screen. So essentially there is a lyric video on screen but the audio is split into 10 channels ( 2 stereo channels, 6 mono channels). This has worked really well however we are running into some current issues.

The system that we have been able to do this on is still running an old Mac OS as well as utilizing Final Cut Pro 7. The reason we haven't fully switched over to Final Cut Pro X is that we have yet to be able to mirror this setup on a current MacOS and current FCPX setup.

We've done research and learned how to properly set up roles, when opening the video in quicktime and viewing the inspector it shows that there are multiple audio files, etc so all of that is right. The thing in Final Cut Pro 7 that we can not find how to do on Final Cut Pro X is ASSIGN the outputs.

In Final Cut Pro 7 theres a option in preferences where you can assign the audio tracks to specific audio outputs. This makes it so when the video is played back using an audio interface the audio automatically routes to the correct outputs. With how it is now in FCPX all we've gotten is audio down mixed to the main two outputs with all the files, no separation. However if loaded in a program like Logic or something we can see all files separated.

I know this was long, but hopefully someone has an answer or guidance for the best way we can do this on a modern system because that old setup is on its last leg.

Thanks a ton!