Or should this be a nifty OLD phase shifter?
https://www.modulargrid.net/e/g-storm-electro-polychrome-phaser
Mmm-hmm...the phaser from a rare AF Farfisa synth from the late 1970s. Six stages, and it looks like way too much fun to just be crammed into 4 hp...but there it is! If you're thinking about adding a phaser to your build, I think this one deserves a look-see.