rekordbox audio output does not come from INTERFACE 2.

Try the instructions below depending on your rekordbox status:
- PERFORMANCE mode (DVS enabled)
Select [INT] or [ABS] or [REL] for DVS mode for each deck.
- PERFORMANCE mode (DVS disabled) or Export mode
Setting Utility: Go to [ROUTING] tab → [Output Routing] and select [USB] (not [THRU]).