Casio CZ/ VZ/ FZ - Pro Series

I am pretty confused about PD.  Can anyone help me here?

1. PD seems to have two different descriptions.  One is the description that appears in the Casio series manuals, where a sine wave is being distorted by a bent sawtooth.  The other is a figure which comes from the PD patent: you can see the figure here https://en.wikipedia.org/wiki/Phase_distortion_synthesis <https://en.wikipedia.org/wiki/Phase_distortion_synthesis>   Note that the sine is being both distorted and then amplitude-modulated.  Can anyone tell me which of the two is correct for the CZ series?  If it's the example in the manual, a sawtooth is easy, but how does one "bend" other DCO Waves so as to distort a sine?  Or does a plain sawtooth get morphed into the DCO wave in question so as to distort the sine?

2. I am confused by the sound output being displayed on various websites, such as http://www.kasploosh.com/projects/CZ/11800-spelunking/7-window-unique.html <http://www.kasploosh.com/projects/CZ/11800-spelunking/7-window-unique.html>  My understanding is that the wave produced by the DCO is used to distort a sine wave, and this distorted sine wave is the final product (ignoring the DCA) sent to line out.  Furthermore, the manual suggests that at one end of the DCW modulation we have a pure sine wave and at the other end we have the distorted sine.  However these websites suggest that the DCO wave can be viewed directly at line out.  What am I seeing here?  Is this the DCO wave?  Is it the distorted sine wave which for some reason resembles the DCO wave?  Etc.

Sean