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Anybody knows anything about X-mod on a PLG150-AN?

This is what I found out but I am not sure if its right. Please 
comment. 

Cross Modulation is an alternative frequency modulation to FM. The 
primary difference is the method . FM is based on a logarithmic 
algorithm while Cross Modulation is based on a linear algorithm.  
They sound different. Cross Modulation gives a metallic sound. 

Cross Modulation works only on VCO2. It used either Triangle wave or 
Sine Wave. There are 2 parameters to work on; Modulation Source an 
Modulation Depth.

If You use the AN Expert Editor, You get the right parameters on the 
screen when You choice Triangle or sine as wave for VCO2.  

If You use Gregson's AN1X Editor You don't get any information on 
Cross Modulation, but it works on the same matter. The parameters is 
shared with VCO2 Pulse Width Modulation Source and Depth. 

The Modulation Source is Fixed, PEG, FEG, LFO1, LFO2. The depth is 
between –64 to 63. 

You can use Cross Modulation to modulate VCO2 or use VCO2 with Cross 
Modulation  to modulate different parameters on VCO1.

VCO2 is a modulation source to VCO1 Pulse Width Modulation, VCO2 to 
VCO1 Sync, and as a FM modulation source to VCO1. 

Yours 

Lemmy Nielsen, Copenhagen