Buchla 291e Triple Morphing Filter

The Buchla 291e Triple Morphing Filter is a three-channel voltage-controlled filter designed by Don Buchla. It is a unique filter that allows for a wide range of sound manipulation and is capable of producing a variety of sonic textures. It has been used by a variety of artists, including Aphex Twin, Autechre, and Boards of Canada.

The filter works by allowing the user to control the frequency, resonance, and gain of each of the three channels. This allows for a wide range of sound manipulation, from subtle filtering to extreme distortion. The filter also features a unique morphing feature, which allows the user to smoothly transition between different filter settings. Additionally, the filter has a built-in envelope follower, which allows for dynamic control of the filter's parameters. Finally, the filter also features a built-in distortion circuit, which can be used to add additional texture and character to the sound.