Nicholas - this note of yours from over 10 years ago was helpful for me today for reasons totally different from why you posted it! I recently bought a second hand pv90 and was trying to reconcile references to the polarity switch and cross-over controls on it that i did not see on my model at all. Now with your post, i am guessing that mine is gen3 too and so that part is explained. Weird how little history is maintained on the net for this model. i will stop searching for the manual now, thank you!