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Zakal Resonant Audio Feedback Instrument - Image 1

Zakal Resonant Audio Feedback Instrument

DesktopAnalog

$402

Imagine plucking or tapping the exposed springs on this desktop beast to coax out wild, percussive shrieks and evolving drones—it's like having a living, breathing feedback sculpture right on your desk.

This analog feedback instrument runs on reverb springs for its core sound generation, with a feedback path that includes a delay circuit (tweakable via Lag for time and Regen for repeats) and a resonant lowpass filter (Cutoff and Resonance knobs let you carve the tone). Feed it an external signal through the input jack, shape it with a preamp offering drive and a hard/soft clipping switch, then blend dry/wet levels before hitting the 3-band EQ. You've got two outputs: a main dry/wet mix and a reverb-only send, all powered by a standard 9VDC center-negative supply in a sturdy 11 x 6 x 2.25-inch enclosure. The front-panel controls line up intuitively along the bottom, and those springs are right there for hands-on manipulation to spark unique timbres.

Players dig its versatility as both a standalone tone generator for ambient drones and a spring reverb pedal for guitars or synths, praising the gritty saturation and physical interactivity in jams and recordings. A few note it shines brightest when paired with other effects for fuller chains, but the raw, organic feedback has hooked experimentalists everywhere.

Released

Unknown

Status

In Production

Synthesizer
Format
Desktop, Experimental
Type
Other
Internal Battery
No
Voice
A/D
Analog
Polyphony
-
Oscillators
-
Oscillator Type
-
Filter
Lowpass
Envelopes
-
LFO
-
Effects
spring reverb, delay
Expression
Aftertouch
No
Velocity
-
MPE
No
Additional
feedback instrument, spring reverb, exposed springs, preamplifier with drive, hard/soft clipping, 3-band EQ, reverb-only output
Software
-
I/O
Audio In
1x (external input jack)
Audio Out
2x (main dry/wet blend, reverb-only)
Headphone
-
MIDI
-
MIDI Type
-
Ports
-
Wi-Fi
No
Workflow
Arpeggiator
No
Sequencer
No
Mod Matrix
-
Memory
No
Measurements
Dimensions
11 x 6 x 2.25 in
Weight
-
Last updated Feb 25, 2026