Casio CZ/ VZ/ FZ - Pro Series

> > It's really pretty limited for straight FM- the voice structure is
>versitile
> > enough in theory, but when operator pairs are strictly limited to
>a
> > modulator:carrier ratio of 2:1, it really constricts things.
>
>I thought that this is where the amp bias/amp sensitivity in the iPD
>[interactive Phase Distortion] scheme of things. Doesn't the amount
>of the amp of any modules that modulate [phase or ring] a sounding
>oscillator provide extensive flexibility?

Well, that's definately cool, but limited as well- for each oscillator the 
amp sensitivity can be set independently (like the DX7, etc.), and this can 
then be modulated by the tremolo LFO or mod wheel or whatever, *but* it's 
only positive modulation, so the LFO can't, for instance, crossfade two 
different modulators, or anything really cool like that.  And since there's 
only one source, you can't use the mod wheel to control the level of one 
oscillator and the foot pedal to the control the level of a different one.  
The modulation options are pretty good, but it seems to me like it's geared 
more torward subtle things.

The amp sensitivity at least is independent from velocity sensitivity, which 
does have different curves, independent for each oscillator, that CAN 
crossfade or switch or whatever.

The fixed modulator:carrier ratio is different, it just means that when a 
two-oscillator pair is set to phase modulation, it's stuck at one frequency 
ratio that makes square wave-ish sounds and can't be changed.  You can get 
around that by muting the modulator and turning on EXT PHASE, letting the 
two previous oscillators act as truly independent modulators.