I am wanting to use 1 CDJ 400 to use as controller for 4 decks in Traktor. I think I am misunderstanding the use of "Focus" within mapping as I assigned a button to change deck focus and thought that the rest of the mappings would all change to control the "focussed" deck, but this does not work. I have an external sound card, so it's not an audio setup issue, just a controller issue. Particularly, it's the jog dial. I want to be able to control the track with the jog dial, i.e. touch up mixes that are going out, etc. Is this actually possible? I can't find any mappings relating to this or to even using 2 decks with 1 CDJ400. I also cannot find anyone else asking or talking about this! I'm not that proficient with mapping, but if this is possible then I'm willing to try to do it but would need some information on advanced mapping first. If anyone can point me in the right direction or offer some insight I'd be very grateful!