Kontakt 2 Portamento module (?)

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Can anyone explain how to employ the portamento module in Kontakt as explained on page 193 of the K2 manual. I cannot determine what to attach it to or how to make it appear with the same controls as the manual shows to get a true portamento. Attaching it to the Source Tune knob does not work (this was my best guess). You get a different effect - not a note transition portamento like you would think. Also, the controls shown in the manual for the portamento module are not present when attached to the Source Tune knob. I just can't see how it is employed and the manual is not helpful here.

Thanks for your time,
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^bump^