Soyons pragmatiques, revenons a la definition :
Envelope filters are wah-wah type sliding filters that are triggered by an input voltage. Unlike standard wah pedals whose center frequency is controlled by moving a treadle, an envelope filter's center frequency is controlled by playing dynamics, allowing for an almost unlimited variety of effects based on expressive nuances in a player's performance.
Donc, une auto wah et un filtre d'enveloppe, c'est la meme chose, vu que dans l'auto wah, c'est la dynamique du signal d'entree qui pilote la position du pic. Ce qui correspond, par definition, a un filtre d'enveloppe...
http://filters.muziq.be/type/filter/envelope/what