Wavetable editing tutorials?

Wondering if anyone knows of a good tutorial on wavetable editing, in Vital or general rules. I just loaded a folder of Virus TI2 WTs into Vital and they unfortunately only almost sound good; there’s a distinct buzzing when moving through the WT position, even on WTs with very little high-freq content. So I’m wondering if there’s a way I can fix that through WT editing.