Don´t know if you have found this guy yet and as he is a Logic user himself he is not very likely to appear in a Cubase forum. Pluginguru (http://www.pluginguru.com), an alias for John “Skippy” Lehmkuhl, has made a lot of tutorials on synths. They are all FREE and available through the given web site. The tuts are mostly on Native Instrument synths like Absynth, Razor, FM8 and Massive. But you also find Sylenth and other stuff there as well.
He also makes, and sells, patches for several synths and I can recommend the one for Omnisphere.
He just made and released a huge drumset for Kontakt (for sale).
I have no personal knowledge of the guy and I do not receive any fees marketing this, but I think guys like this, giving away work for free for others to improve and succeed, deserves all the credit they can get. Yes I know that the free stuff also is a marketing tool for what´s being sold on the site, but you are not obliged to buy anything.