Miden,
Just by looking at the panel button (the sound categories specifically) there is no "user" section. There are however 64 user performance slots. Set up just like an arranger too--just a snap shot of all your current settings. However this may be another way around not having user slots for custom voices. If the performance space will save the knob assignments then you can save tweeked sounds that way.
Also from what I've been told there is not a pattern sequencer (or style recorder) on the unit either. I'm sure that you can make limited adjustments to the prest patterns and save those to the performance memories, but as far as creating a custom pattern from scratch--I don't think this unit will do that. I also don't think you can store custom arps either. The unit has 213 preset arps but no mention of anything in regards to user arps.
I heard from Yamaha that the 8 track sequencer on the unit is strictly linear. I would assume it's the same as the S-500. I also don't see room for user patterns, however much of these limitations (in regards to the sequencing) can be overcome by using the included software or any other software application.
[This message has been edited by squeak_D (edited 01-15-2007).]
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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.