Some of the S2 Mk2's advantages vs. MC4000: #1) Better (more intuitive) loop implementation using two (2) encoder/button knobs and regular buttons vs. regular buttons only; #2) Encoder/button gain and (shift-accessed) filter knobs that push-resets to null vs. basic encoder knob only

Separate, simple sampler section and slicer (alliteration, anyone?) function vs. more robust/complicated Traktor mix-deck implementation (personal preference); #11