Kurt Cobain’s Electro-Harmonix Echo Flangeraccess_time First seen circa 1993
This pedal was used extensively during the ‘In Utero’ era, including the studio sessions for the album. According to Kurt’s guitar tech Ernie Bailey, depending on the day, Kurt would use either this or a PolyChorus for live performances. [Nirvana: Super Fuzz Big Muff]
An important thing to note here is that the Echo Flanger and (vintage) PolyChorus are actually pretty much identical, as they share the same circuitry. Therefore, whether Kurt used this or the PolyChorus on ‘In Utero’ is a point really not worth debating.
The pedal was also brought to MTV Unplugged rehearsals, but apparently, it created unwanted buzz/hum. You can actually hear Kurt strum his guitar at around 0:34 in the video below with the flanger turned on, and stating – “they hearing some kind of buzz from this.” (thanks Sebastian). This is also confirmed by Kurt guitar tech, Ernie Bailey.
The Echoflanger was also brought to the rehearsal [of MTV Unplugged] but it wasn´t used because they created too much 60-cycle hum.Ernie Bailey – kurtsequipment.com
Apparently, Kurt owned only one Echo Flanger, and during the rehearsals for ‘In Utero’, the pedal broke. Kurt’s guitar tech, Ernie, managed to fix it, but Kurt was worried for a moment because, without it, he felt the album wouldn’t sound as he wanted it to.
They were practicing the night before and Kurt said that his Echo Flanger was broken. Kurt said, ‘It’s the entire album—it’s got to work!’ He had been using his Echo Flanger to do all of this material, and I think he was worried that it wouldn’t sound the same.Nirvana’s In Utero by Gillian G. Gaar