6x6 delete one track and replace it

I exclusively use Aeros 6x6 mode for playback of backing tracks. These are all created outside of Aeros and loaded on the SD. Sometimes I want to re-do one of the tracks that I don’t like. Unless I’m mistaken, I now have to delete and the tracks in the song and put them back in with the revised track. Would love to be able to replace one track as necessary rather than all of them. Thanks’