Waves Bass and WASAPI

Recently bought both Finger and Slapper Bass VSTi. Both are AMAZING. But when rendering (reaper) they are left out. Tried rendering only that thack and it came empty. I thought it had something to do with my Device config. Can’t use Sadly can’t use Asio4All because it alter some drums sounds (with a specific plugin) so I’m using WASAPI. Tried changing it to DirectSount and… voila… everything works great. I also had some trouble using Flow Motion and it’s sequences… and zero problems after changing those Device settings. Is there a known issue using WASAPI? Or maybe it need some special config?