DB4/K2's vs Z2/F1/X1

[photojojo]

2 track decks + 2 remix decks needs 4 channels of mixer. X1 + F1 work great together.

Just to clarify, the F1 has the volume faders for the remix decks but do you also need to allocate a channel on your external mixer for them too?

You need at least one channel for the two remix decks. I've always routed sample decks/remix decks to one channel when using an external mixer and just leaving the volume all the way up on that channel all the time. I like the way the Z2 has it with a rotary for the C & D channels.