Hey DJ Russell simply smooth,
The Denon MC6000 is not natively supported in Scratch Live, so it would need to be manually MIDI assigned. If there is a mapping for this available it would most likely come from Denon, you may be able to find it on their forums ->
www.denondjforums.com
If you'd like to manually MIDI assign the controller yourself, you may wish to read this article on how to do this ->
serato.com (click link). Note that you can't MIDI assign control of the virtual decks in Scratch Live.
I hope this helps :)