Sure Copy/Paste would work but wouldn't it be easier just to select the Voices you want to edit and off you go ? You can hear the results instantaneously without having to Copy/Paste then make a small edit....then Copy and Paste...over and over.
Then we might be able to link the Solo Buttons with the Voice buttons. Solo Voices 1,2, 3 and that selects all three for editing. You could have an on/off switch for that behavior as well.........
Certainly not the most important feature request for DUNE 2 but something I'd probably use.
Ok I'm off to watch the USA lose to Belgium..........
EDIT: Good Lord I can't believe the crowds that are gathering all over the country to watch this match.....I've never seen this level of interest in the World Cup here........