Hand-written note with Kurt's settings for the polychorus (for Heart-Shaped Box and Radio Friendly Unit Shifter): ehx.com/blog/ehx-tone-tips-the-sound-of-nirvana From kurtsequipment.com: Effects: 10). Electro-Harmonix EchoFlanger (32)(40) and Electro-Harmonix PolyChorus (37)(seen 15). Despite the different names, the Polychorus and Echoflanger had the same internal circuitry. Kurt supposedly only had one EchoFlanger, despite what is said in (32). Kurt used the EchoFlanger on the Brazil shows (source info? Rio perhaps?) and the song "The Priest They Called Him" (found on various bootlegs, etc.). Both pedals were taken on the "In Utero" tour. The EchoFlanger sometimes "acted up" and Earnie gave Kurt his PolyChorus as a back-up. This PolyChorus was used on "In Utero" for the "Heart-Shaped Box" solo, "Radio Friendly Unit Shifter," and "Scentless Apprentice" (41). Earnie sent out another PolyChorus to Kurt, hoping to get his back, but the "new" one broke and was given to Eric Erlanderson of "Hole" who had it fixed. Earnie did eventually get his PolyChorus back, but not before Kurt marked his settings on it with nail polish and put Velcro on it. The EchoFlanger was supposed to be used on "Unplugged" but caused too much 60-cycle hum in the control room. Courtney now has Kurt's EchoFlanger (40).more
This is a great analog multi-effect (sort of) pedal! All effects are delay based, you have Filter Matrix (which is sort of a "frozen" flanger, you can manually move it or set it on a fxed position), Flanger (a bit mild, not as pronounced as the usual suspects), Chorus (which goes from subtle to too-much-with-a-bit-of-delay) and Double Track (which is basically a short delay). It might be a bit of work to find a regular chorus sound, if that's what you're after, but it it possible. I like to use it (in Chorus mode) with both Rate and Range set at 9'o'clock, Delay and Feedback off. And the noise possibilities on this pedal are awesome. In any of the 4 modes you can go into self-oscillation by turning the feedback knob all the way up, and get weird noises by moving the other parameters around after that.
This pedal has become my security blanket. Playing a solo? Flange with wide berth at a ridiculous rate. Rhythm chords? Double Track, with zero feedback. End of the show? Crank every knob to 11 and watch your audience members run out with their ears in their hands. Or set it to Filter Matrix and let it rip through the mix like a saber made of light. "I guess you guys aren't ready for that yet... But your kids are gonna love it." -Marty McFly