I found out some more about the refine command - it needs parameters as well. If I catch it in the 3 seconds that the search parameter is on the display it will accept it. It won't refine with the same parameter as the search (artist, album, etc.).
Search artist Cream
While Cream is on the display hit the button again
Refine album Disraeli Gears
Sync lady repeats it, Disraeli Gears comes up on the display - 3 seconds later back to whatever is playing.
It looks like Search and Refine are both useless commands.
Some "interesting" design choices here. We don't get any radio voice commands, but have some that are utterly useless built in.