Check the listing for details. Agena Envelope Filter Guitar Effect Pedal. Condition: New. Listed at 59.99 USD. #html-body [data-pb-style=U8Q80VA]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}The Maestro Agena Envelope Filter pedal is designed for ease of use and is tailored for optimized dynamic control. The Agena offers two distinct filter frequency options for a wide range of tonal possibilities. Musical and inspiring, it will surely bring on the funk. This all-analog pedal boasts a two-position Mode toggle switch for increased sonic versatility. The LO mode setting focuses the filter in a lower frequency range, while the HI mode emphasizes a higher range of frequencies. The intuitive 3-knob control layout lets users quickly set the desired Sense (the envelope’s sensitivity.