I blatantly named this one whilst watching Stranger Things. I make no apologies :)
Eleven is a versatile chorus based on the Zombii chorus which I am advised was designed by John Hollis and has undergone several adjustments by the DIY community over the years.
With mod switches for chorus / vibe and clone which basically gives more or less intensity to the effect, you get a very useable pedal.
The board is spaced for PCB mounted toggles and pots, although they are positioned closely so be careful with which knobs you order.