I just got an external touchdisplay connected to my computer and the first thing I had to try was sketching some spectral filtering actually with my fingertips.
How crazy is this!?
All in all it became a nice little abstract sounddesign jam :)
Iris2 seems to be pretty cheap right now: https://www.izotope.com/en/shop/deals.html (no guarantee for izotopes contents and prices)