Resotron

The Resotron is an analog envelope filter pedal designed to deliver classic 1970s synthesizer filter sounds. Utilizing a 24dB/octave state-variable filter circuit inspired by the SSM2040 chip from vintage Prophet 5 and Octave CAT synths, this pedal supports both Up and Down sweep modes. Core controls include a Sensitivity knob to set filter response to playing dynamics and a Glide control to adjust the attack time and speed of the filter’s pitch-based movement. In addition to traditional envelope filter operation, the Resotron features an analog pitch-tracking system, allowing the filter cutoff to follow the pitch of incoming notes. The pedal offers compatibility with both guitar and bass instruments for flexible use. **Key features:** - Analog envelope filter pedal with 24dB/octave state-variable filter - SSM2040-style filter design based on classic synthesizer circuits - Up and Down sweep modes - Sensitivity control for dynamic response - Analog pitch-tracking filter with variable Glide for cutoff transitions - Compatible with guitar and bass instruments