Has Casio dropped the synth edit from their arrangers now?  In the specs you don't see it listed anywhere with these new models. With the models they've released I see they've added things such as 48 note poly, sampling (although quite basic), and a pattern editor as well, and increased seq note capacity up several thousand notes.  Perhaps they swapped out the tone edit for these new features.  
I always thought the Tone Edit on these lower end Casio's was a great feature for the novice to get their feet wet.  It looks like the Tone Edit is now for the higher models.
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GEAR:  Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller).  SOFTWARE:  Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.