While I don’t have an S4 nor do I DJ (my partner does), I do have Traktor Pro 3 and an Ultralite MK5. If Traktor supports external sends then, somewhere in the Traktor audio setup, you would use a pair or Line Out (3 and 4 perhaps) to the AH inputs then the AH outputs back into the UL5 (line inputs 3 and 4). Then, if possible in Traktor, assign one of the effects knobs to control the send amount. You would also need to use MOTU Cuemix to setup the proper monitoring/mix.
I’m just waking up here but I can look into it for you. My partner has an old S2 kicking around that she uses to audition tracks on the couch or “not in the studio”. We’re otherwise a CDJ household.
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