Despite what the manual says, I can't seem to locate the WT-68, WT70 from the drop down menu next to the OSC modules
@Larry Weissman The names of the Wavetables have been changed in the meantime. This information was never corrected in the manual. All the wavetables here with proper names replace the WT-number:
So, the tutorial in the manual might not be possible to follow. It might take a while for this being changed. I would recommend tutorials on Youtube like this one to get to know Massive wavetables: