Rack-mountable feedback module for modular synthesizers that features a tuned feedback line for sound mangling; a resonant, low-pass filter for tone shaping; and a triggerable noise source for Karplus-Strong-type plucked string synthesis. Tuned feedback has been a part of the Dave Smith tonal palette since the ground-breaking Evolver, and is also a key sound-shaping component of the Pro 2 and Prophet 12 synths. The module provides interconnections using 3.5 mm phone jacks, one audio input and one audio output as well as an audio trigger input for the noise source. A set of inputs allow individual voltage control of feedback amount, tuning, low-pass filter frequency, and filter resonance. The 4-pole, resonant, low-pass filter is a digital design, based partially on classic analogue filters of the past. It features over-sampling and numerous refinements to the signal path, which is 24-bit, 96 kHz resolution for outstanding audio fidelity. It is a great-sounding design that works well both in the feedback context and as a stand-alone tone-shaping tool. Mounting screws and ribbon cable for power connection are included. Dimensions: 50.5 x 128.5 x 39 mm. Width: 10 HP.