
@Christoffer > Thats because 'internal' mixer vs 'external' mixer. On Traktor, the mixing is done internally (within the software) therefore you can record internally. With rekordbox, the audio is 'mixed' on the Nexus. You will need to route the master output back to your computer and record via LINE-IN or some alternative method as well as using appropriate recording software such as Audacity or Logic.