The 3 Leaf Audio GR2 is absolutely one of the most versatile envelope filters on the market today. It's circuit is derived from the infamous Lovetone Meatball, which means a ton of totally unique sounds. The large frequency and dynamic range makes it equally suitable for bass, guitar, keyboards/synths, samplers and general studio use. ...

The Mutron III envelope filter was a staple of 1970′s funk and soul music that shaped the sounds of Bootsy Collins, Stevie Wonder and Jerry Garcia among others. But as good as the Mutron sounded, it was not without its problems. It was huge and required a special power supply, and it had a sensitivity control that changed your volume when you kicked it on. Then there’s the price – originals routinely fetch $500 or more on eBay! ...

The Wonderlove is a dynamic envelope filter with a tonal palette limited only by your imagination. It offers total control while remaining easy to use. The Wonderlove takes the classic sound made famous by Stevie Wonder in “Higher Ground” and takes it to every extreme! ...

Dwarfcraft's first foray into the digital realm, the PG smashes your signal down into 8 bits of mayhem, and then tosses them up and down in pitch, in intervals of your choosing. ...

Plug into the Electro Harmonix Micro Q-Tron Envelope Filter and wah them while you wow them! The Electro Harmonix Micro Q-Tron Envelope Filter is a dynamically controlled filter effect that is great for guitar or bass. The power of your attack controls the cutoff frequency of the filter from subtle wah to all out WAH! ...

An envelope filter with optional distortion for some very unique vocal-like sounds and funky effects. ...

The Electro-Harmonix Q-Tron - the phattest, funkiest envelope filter ever made! Features like switchable Boost and Filter Mix mode allow for an unlimited supply of all-new auto-wah effects that drip with attitude. Increased frequency response and improved signal-to-noise ratio make the Q-Tron perfect for use with any instrument. ...

With an added effects loop and attack response switch, this is the Q Tron you’ve been waiting for. With the ability to run delays and overdrives in the effects loop, now your picking dynamics will not be overpowered by your other stompboxes – instead, you will hear the effect on the effect filter rather than on your original signal dynamic. ...

Your guitar signal will be massaged by a complex set of filters moving through a vacuum tube maze. Energized by two Electro-Harmonix 12AX7 tubes, the Tube Zipper's patented moving filter tastefully adds controlled analog harmonics to your signal. ...

The Mad Professor Snow White Auto Wah is a compact pedal based on a 1991 BJF rackmount remote wah unit. Perfect for guitar or bass, this little guy is tight and sweet with excellent transparency and a funky vibe. ...

The Mad Professor Snow White Auto Wah is a compact pedal based on a 1991 BJF rackmount remote wah unit. Perfect for guitar or bass, this little guy is tight and sweet with excellent transparency and a funky vibe. This is the economic PCB version that shares the same components and specs as the Handwired version! ...

The Mad Professor Snow White Auto Wah is a compact pedal based on a 1991 BJF rackmount remote wah unit. Unlike most auto wah pedals, the Snow White Auto Wah is tuned to wah pedal frequencies and that’s it. No harsh fizz on the top end or bubbly bottom in the low. The guys at Mad Professor tuned the Snow White perfectly for guitar or bass. ...

Featuring the defining component in the most desired analog envelope filter pedals- the VTL5C2/4 vactrol, you get super rich sound in an unprecedented tiny enclosure at an affordable price. ...

The Analogue Filter 442 is based on the old classic DOD 440 Envelope Filter pedal, but with some improved features. If you are looking for a foot-free wah, this might be it! ...

Brand new from Mojo Hand, the Analogue Filter 443! This is an expanded version of its predecessor, the 2-knob Filter 442. This new version offers much more control for a broader range of funky filter effects! ...

The Flying Eye has been completely redesigned to be a true auto wah rather than an envelope filter. Due to this it is now one of the most flexible boutique auto wah pedals available today. ...

Vintage Quacky Tones! Based on the circuit of a vintage MXR Envelope Filter. The Phollower’s design was kept true to its’ vintage origins. ...

The Xotic Effects Robotalk 2 pedal features two individual envelope filter channels. Each channel is independently voiced and can be preset for different playing style; slow acoustic-like attack,percussive, high speed open-close and many more. Blend each channel together for additional tone or use the internal dip switch to customize your sounds appropriately. There's a switchable input pad for accommodating both active and passive signals. ...