Well, sadly, the wavpro3 URL now directs to a page featuring... far eastern ladies engaging in questionable behavior. (And a pox on algorithms that restrict the words we can use!)
But on a more positive note, my first successful wavetable: a sine wave in various phases. This allows for "linear FM" by Osc 1 and/or 2, with no shift in pitch as the modulator amplitude and/or waveform are changed. Complex 3-operator FM!
Downside: it's really only useful for basses, since the band limiting in Osc 3 pretty much wipes out the effect of FM in the upper keys.