Lum seeks to illuminate your path with three unique granular and textural reverb modes, momentary automation, and presets.
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Your reverb pedal is fine. It does the thing. It makes the sound bigger. Good for it. But Lüm isn't here to make sounds bigger — it's here to shatter them into tiny atmospheric fragments, wrap those fragments in lush reverb, and hand them back to you as something you've never quite heard before.
Built around granular processing and three distinct texture modes, the Lüm Texture Engine is for players who hear a standard reverb tail and think, "yeah, but what if it was weird?"
Three Modes, Infinite Rabbit Holes
Lüm isn't a one-trick pony. It's more like a three-trick pony, and each trick is genuinely strange in the best possible way. Each mode fractures your input signal into microscopic audio "grains," then suspends them in its own unique textural environment — from glitchy grain clouds to the hypnotic push-pull of forward and reverse reverb.
Mode I – Grain Cloud: Dual taps read from a feedback delay line to generate a granular texture packed with organic movement. The X knob dials in grain size, controlling how often those signature glitches interrupt the signal. Stack it with modulation or wet effects for truly uncharted sonic territory.
Mode II – Grain Verb: Grains pulled directly from a reverb algorithm's delay memory create a dense, immersive wash where texture and reverb become indistinguishable. Walrus’s words, not ours: "almost as if the grains just took a bath in reverb." Try it before high-gain pedals for results that defy easy explanation.
Mode III – Forward / Reverse Verb: Two reverb algorithms — one running forward, one running in reverse — interact in real time for a rhythmic, almost conversational effect. The Stretch knob controls the tempo of this interaction, and the X knob shapes the reverse reverb's decay.
Real-Time Expression That Actually Does Something
Lüm's Moment Control and Stretch Engine aren't just bonus features bolted on to fill out a spec sheet. They're legitimate performance tools that let you reshape sound on the fly without ever breaking your flow.
Moment Control: Assign any one of the five knobs as an automation target, then hold the Moment switch to glide to that value in real time. It's expressive, it's dynamic, and it makes your pedalboard feel like it's alive.
Ramp Settings: Hold Bypass and toggle the Mode switch to set the automation glide time — choose from 10 ms, 1000 ms, or 5000 ms depending on whether you want a snappy snap or a slow, cinematic drift.
Stretch Engine: Globally shift the sample rate from 0.5x to 2x speed to stretch or compress time across the entire signal chain. It interacts differently with grain size, reverb decay, and filter tone in each mode, meaning a single knob turn opens up a completely different sonic landscape.
Presets and Bypass Built for the Stage
Live performance deserves tools that keep up — not tools that make you stop, crouch down, and fiddle mid-song. Lüm's preset system and dual bypass options are designed to slot cleanly into a live rig without introducing any unpleasant surprises.
Three Onboard Presets: Save and recall up to three settings (Red, Green, Blue) and transition between them with seamless crossfades. No jarring jumps, no dead air — just smooth, professional transitions from one texture to the next.
Trails Bypass: Keeps the reverb tail decaying naturally after the pedal is bypassed, so your sound fades out the way reverb is supposed to — gradually and gracefully.
Instant Cut Bypass: Kills the signal immediately on bypass for sharp, rhythmic stops that serve as a deliberate creative choice rather than a limitation.
A Pedal That Earns Its Real Estate
Pedalboard space is sacred, and every pedal has to justify its footprint. Lüm more than justifies its — it makes every other pedal on your board sound more interesting just by existing near them. With granular reverb processing, expressive automation, seamless preset transitions, and a trio of genuinely unique modes, this is a texture engine that rewards experimentation every single time you plug in.
Walrus Audio Lum Texture Engine Pedal Features:
Create immersive backdrops that move and shift with every note to blur the line between instrument and ambient sound design with three unique modes:
Mode I - Grain Cloud: A granular texture built from dual taps reading from a feedback delay line. The X knob controls the grain size, or how frequently you’ll hear the “glitches” happen. Experiment stacking with other modulated or wet effects on your board to create all-new sounds.
Mode II - Grain Verb: A granular reverb built from dual taps reading from the delay memory of a reverb algorithm tank. The result is a dense, washed-out texture where grains are fully embedded in reverb. Almost as if the grains just took a bath in reverb. The X knob controls the grain size, or how frequently you’ll hear the “glitches” happen. Tip - Lüm is a treat to put before high-gain pedals in mode two.
Mode III - Forward / Reverse Verb: A forward reverb algorithm running into a reverse reverb algorithm. You’ll hear a playful rhythmic interaction between the forward and reverse reverbs. Use the Stretch knob to change how fast or slow this interaction is. The X knob controls the reverse reverb decay.
Moment Control - Lüm allows you to automate any one of the five knobs by holding the Moment switch to glide to a defined target, adding dynamic, expressive motion in real time.
Ramp - Holding Bypass and adjusting the Mode toggle allows you to adjust the automation glide time between 10 ms, 1000 ms, and 5000 ms.
Stretch Engine - Globally shift the sample rate from 0.5x to 2x speed, stretching time, and interacting uniquely with grain size, reverb decay, and filter tone.
Presets - Save and recall up to three onboard presets (Red, Green, Blue). Sounds fade seamlessly between presets for smooth live transitions.
Bypass Modes - Choose between Trails for natural decay or Instant Cut for abrupt, rhythmic stops.
Finish: Available in Guava Gloss or Matte Black, featuring exclusive illustration by Emily Ursä.
Dimensions: Enclosure measures 4.77" x 2.6" x 1.39" (including hardware).
I/O: Single 1/4" TS Input; Single 1/4" TS Output.
Input Impedance: 1M ohm
Output Impedance: 100R ohm
Power: 9VDC, 100mA minimum.
Recommendation: Use an isolated power source for optimal performance; avoid daisy chains.
Note: Power supply is sold separately.
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Frequently Asked Questions
Granular reverb works by breaking an audio signal into tiny fragments called "grains," then layering and manipulating those grains to create dense, shifting textures. Lüm uses this technique across three distinct modes to produce sounds that sit somewhere between reverb, ambiance, and outright sound design.
Grain Cloud generates texture from a feedback delay line, creating an effect that's glitchy and full of movement. Grain Verb pulls those same grains from within a reverb algorithm's memory, producing a denser, more washed-out sound where it's hard to tell where the reverb ends and the grain begins.
Absolutely, Lüm was practically made for ambient playing. Its three texture modes, Stretch Engine, and Moment Control combine to create the kind of evolving, atmospheric soundscapes that ambient players spend hours chasing.
Moment Control lets you designate any one of the five knobs as an automation target. Holding the Moment switch causes Lüm to glide toward that target value in real time, adding dynamic, hands-free expression without requiring any external controllers.
Yes, Lüm is designed to play well with others. Mode I (Grain Cloud) pairs especially well with modulation and wet effects, while Mode II (Grain Verb) produces interesting results when placed before high-gain pedals. Its global Stretch Engine also interacts differently depending on what's before or after it in your signal chain.
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