My favorite is envelope filter. Most on my list are specifically envelope filter pedals; others have various functions but include an envelope filter in them. Here's my complete list of the ones I've owned (the ones I still have are at the top in bold letters and underlined): EHX Riddle; Multivox Big Jam Spit Wah; Jacques Trinity Wah; DOD FX25B; Mars Yesman+; Mowery Electronics Dynatron; Korg AX3G “Filtron” (custom); Musitronics Mu-Tron III; Univox Effectmatic (Licensed ‘70s Mu-Tron III clone); Seamoon Funk Machine; Korg Synthepedal; Moog Moogerfooger MF-101; EMMA DiscumBOBulator; Ibanez and Maxon AF9; 3Leaf Audio Groove Regulator and GR2; EHX Enigma, Micro Q-Tron, Mini Q-Tron, vintage Q-Tron+, and Tube Zipper; Subdecay Prometheus and Proteus; Source Audio Bass Envelope Filter; Chunk Systems Agent 00Funk (Mark I and II); Line 6 OTTO Filter; Tweaktronix (Subdecay) Dynamic Filter; Menatone Mail Bomb (newer 4-knob version); Guyatone WR2, WR3, WRm5, Crossover Box, and Ultron; Boss FT-2 and SYB-3; EBS BassIQ; WMD FatMan and Super FatMan; Hartman Envelope Filter; Ashdown Bass Envelope Filter; Mars Mini Yesman; Peavey Spectrum Analog Filter (rack); Roadrunner Flexitone Distortion Auto Wah; Eowave Filter Bug; Electrix Filter Queen (half-rack); Vestax DWG-X1 (half-rack); Digitech Vocal 300 “WEFUNK” (custom); Ibanez SB7 and AW7; Behringer DW400, VB1 and UW300; Rocktron Heart Attack; Digitech Synth Wah; Onerr Touch Wah; Memphis Attack Trigger; DOD FX25; Modtone Funk Filter; Wilson Envelope Phollower; Solid Gold FX Funkbox; Mojohand 443 Analogue Filter; VFE Mini Mu and Mini Mu Jr.; Eleca Automatic Tune; Henretta Engineering Big Zapper; Meatsphere (Lovetone Meatball clone without FX Loop and Pedal 1 and 2 inputs); full-featured Lovetone Meatball clone So whether your favorite is envelope filter, phaser, fuzz, octaver, overdrive...whatever it is, let's see your complete list of the ones you've owned! Don't worry if you've forgotten a few; just write the ones you remember buying (in fact, I just remembered a few as I was typing this!). Don't be ashamed...you're among friends...we're not here to judge!