Small request here: A robust filter effect, one with a number of different filter types (more than the standard, HP/BP/LP), and maybe some different saturation options along with a display of the filter itself (for visual reference of filter type).
I don’t know if Steinberg has anything like than in their arsenal, or if Waves could fill that void, but I’d certainly pay for it as an IAP.
Just an idea! 
Seems like Cubasis would benefit from it.