The Echo Flanging poly Chorus (EFPC) by Discordance Electronics is a one off custom built clone of the rare vintage Electro-Harmonix EHX EchoFlanger/PolyChorus pedal, it uses the Lectric-FX Dandy Horse Echo Chorus/Flanger board.

Works well with no issues. Clone of the EHX pedal made famous by Nirvana's Kurt Cobain (used on In Utero era songs like IHM&IWTD and Radio-Friendly Unit Shifter)