Casio CZ/ VZ/ FZ - Pro Series

>   yes i'm familiar with the HT-series functions, but how does this 
>"single-cycle waveform" really work ? is it a sampled waveform looped or is 
>it some kind of analog ?

As I understand it, it's not really samples or analog- just very primitive 
16-step digital waveforms.  They're played at a high sample rate so there's 
no audible aliasing.  But obviously they're not very pure waveforms- the 
triangle wave on the HT series has a lot of overtones so it really doesn't 
sound much like a triangle wave.  I think it sounds really good this way.  
Also there's some kind of waveform crossfading (as you can hear on the 
MT-68's "cosmic tone" sound, for example) but this isn't editable in the HT 
series.

I think most Casio models (except MT-70, MT-35, CZ, VL, PT, etc.) used this 
until the sample-based stuff came out.