If you're looking for an envelope filter, the Electro Harmonix Micro Q-Tron has you covered. Funky auto wah effects and more. Plug into the Electro Harmonix Micro Q-Tron Envelope Filter and funk it up!
The Electro Harmonix Nano Doctor Q Envelope Filter is as easy to use as pie. One knob for Range control and a Bass boost switch are all you've got. Your playing and the Electro Harmonix Nano Doctor Q Envelope Filter take care of the rest.