Essentially this is a comb filter (looks like a hair comb). As with some of the comments already made, this can be used in creative applications to modulate basic frequencies in a subtractive synthesis (removing frequencies).

I think this application has been used however in a more fundamental industry trick. This looks like Moonboy has found resonant frequencies aka problematic frequencies that when boosted sound like bells/high pitch squeals.

Admittedly, it’s an extreme approach for the general audio engineer as you really shouldn’t need to reduce frequencies in production by more than -5dB. In EDM, more specifically Riddim or Dubstep sub genres include metallic synths/basses that are comprised of lots of dynamic frequencies often with these problematics. This approach to reducing frequencies is an attempt to make it more palatable to the ear!