Retk1800 Sound Trials (Kat)

The playlist below contains recordings of the Retk1800 with Kat profile keycaps. Each recording uses a different method to control the sound profile with in the Retk1800 case:

This is a continuation on my Retk1800 build. You can see previous posts, Retk1800 - The Missing Manual and Retk1800 Build Log, for more details.
  1. 4mm of vibration foam
  2. Polyfill
  3. 4mm of foam + Polyfill
  4. Nothing/Empty

I am sticking with the mix for now, but I am not 100% it makes a difference. I would love to hear if you find one consistently better than the others.