4-channel audio interfaces:
MOTU M4
Apogee Duet
Audient ID14
SSL 2+
Presonus 26C
Scarlett 2i4
Universal Audio VOLT 4
Universal Audio VOLT 476
Traktor Z1 (minus the MIDI controls)
NOTES:
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Re: Native Instruments Audio 2 - this device has been discontinued. My personal experience has also been that it is no longer supported in iOS.
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the Numark DJ2GO2 Touch and Hercules Starlight have built-in audio interfaces. If you go this route, you could re-map some controls for FX and Neural Mix, which can be handy.
