After reinventing analog chorus, vibrato, and phaser effects with the Warped Vinyl and Wombtone (and newly released Warped Vinyl MKII if that appeals to you, then quality becomes important. Verdict: A unit that deserves some serious consideration. Premier Guitar ( USA) May 2012 Given the low price, solid build, and smooth, versatile sounds, anyone on a budget that’s looking for the distinctive sounds of an envelope filter will want to have a look at this pedal. Ditching the filter select footswitch in favor of an envelope kill switch would make the pedal a double threat. But that omission aside, it’s super intuitive and fun. The Classic Optical Envelope will certainly brings the funk. And while it may not achieve the musicality of a vintage Mutron III, you’ll be thankful to not have to pay the vintage price.