@Francesco > The SEP-C1 is fully MIDI capable and can be controlled in Traktor 2 and should also show the display like on the CDJ-400's. The only thing is, I don't believe the CDJ-400's have a preset .tsi file in Traktor 2 since they are older. I would think the SEP-C1 should have a .tsi file in Traktor 2, but if it doesn't, you would need to create one yourself.
Thanks,
Foster