Other key pedals used by grunge bands included four brands of distortion pedals (the Big Muff, DOD and Boss DS-2 and Boss DS-1 distortion pedals) and the Small Clone chorus effect, used by Kurt Cobain on "Come As You Are" and by the Screaming Trees on "Nearly Lost You". The DS-1 (later DS-2) distortion pedal played a key role in Cobain's switching from quiet to loud and back to quiet approach to songwriting. The use of small pedals by grunge guitarists helped to start off the revival of interest in boutique, hand-soldered, 1970s-style analog pedals. The other effect that grunge guitarists used was one of the most low-tech effects devices, the wah-wah pedal. Both " Thayil and Alice in Chains' Jerry Cantrell ... were great advocates of the wah wah pedal." Wah was also used by the Screaming Trees, Pearl Jam, Soundgarden, Mudhoney and Dinosaur Jr.