[Zubersoft]

I'll consider making those changes to the batch edit screen in a future update. That will require a fair number of UI updates and behavior changes, along with a bunch of testing, so I'll have to wait until some of the other high priority tasks are addressed before I can work on it. For now, I think the best approach is to go to the Instruments tab, create a new Instrument called "Duet", edit that instrument, then in the group editor, set up filters to show you only the songs you want to add to Duet. You can then tap the icon with two arrows to add all of those songs to the Duet instrument all at once.

Thanks,
Mike