PAULD

Paul, the CT-X3000 and 5000 are identical in terms of organ sounds and user tone editing.  Are you looking at the 5000 for the modulation button that can be setup to switch rotary speed?  The full rundown of changes between the two models are this, the 5000 deletes the battery power option and adds the following....

8 additional system reverb types
4 additional system chorus types
5 additional system delay types 
User 4 band semi-parametric master EQ 
50 additional user rhythms
Modulation/assignable button
Tone and Rhythm category buttons

Lighted registration buttons
Line out terminal 1/4" x 2
Microphone input 1/4" 
Mic volume knob
Speaker system 15w x 2 (6w x2 for CT-X3000)

Yes, I'm upgrading ($150) more to get the modulation button. Also I hope I can copy my Hammond organ presets that I set up on my CTK-7200. I love the piano sounds of the CTX series but what's a keyboard without a good Hammond simulator.? Thanks for your concern, Paul

The CT-X series, including the CT-X5000, does not have the virtual drawbar organ found in the CTK-7200.  Casio moved the virtual drawbar organ to the MZ-X series.