-The SZ have 4 colour fx and the SX have hp-lp filter, and also efx knobs on the mic and master channel on the SZ.
-You can adjust the tension on the jog wheels and the start/stop speed on the SZ,
-You have dual deck controll on the SX,
-Adjustable tension on the crossfader on the SZ
-Browse knobs on each "deck" on the SZ, one on the SX
-Ocillator efx on the SZ.
-you can choose colours on the preformance pads on the SZ