Envelope Filter

FTelettronica is an Italian one-man shop in Isola del Liri, founded in 2008. They build faithful clones of rare and discontinued effects, using Alpha pots, Neutrik/Lumberg jacks, and a 2-year warranty.

The Envelope Filter is a voltage-controlled low-pass filter where cutoff frequency tracks input amplitude. Five controls: Threshold (sensitivity), Attack (rise time), Emphasis (resonance peak), Up/Down (reverse sweep direction), and Filter Range (switchable cutoff ranges). Works with guitar, bass, keyboard, and other instruments. 3mA draw, 248g, powder-coated.

The reverse sweep and switchable filter range give this more versatility than basic envelope filters. Low power draw means it plays nice with daisy-chain supplies. True bypass.