I don’t think this is really super unique but it’s worked very consistently for me in addition to the tapping technique. I picked it up from La Marzocco Home, but it can be purchased unbranded from the local company here in SLC that makes it.
To be completely honest if you have a good grinder that resists clumping to make it quicker/easier/unnecessary to break up grounds I think that you’d be hard-pressed to even measure a difference between tapping and something fancier, let alone taste it in the cup. As intriguing as the idea is.
I think some things work well enough, though I’d never try to discourage people from experimenting as you might find something that completely changes the game. The idea of sonic distribution sounds super cool, I’d love to know if it made a difference or not. It almost seems like from the top down that could potentially distribute and tamp/pack the puck if you had an apparatus that acoustically sealed the top and bottom of the portafilter… I’m just fairly skeptical with all of the research that has been done into how little of a difference so many variations of technique make, consistency and knowledge of general extraction being the key things. Good luck!