The Yamaha AN1x Synthesizer mailing list

I was not clear in my first question, about FM versus Cross-mod. Here 
is my understanding of the AN1x/PLG150An  situation:

An1x has FM, Ring Modulator and Oscillator Sync

PLG150AN has FM, Ring Modulator, Oscillato Syn AND Cross Modulation 
(VCO2 modulates VCO 1)

So, what is this addition? My assumption is that they added this 
feature in the process of making the synth more prophet 5 like. 
(though they have not added a feature to modulate filter with osc 1 
which a P5 could do.)I follow theoretically what the ring modulator 
and the FM do, but I would think that together they would render a 
separate osc cross modulation function irrelevant. Don't you think?

Hence my question.

Cheers,

Jerry