The Glowfly Pyroglyphs is a reverb pedal from UK builder Glowfly, hand-built in Lancashire. Delicious Audio's Paolo De Gregorio described it as "a haunting reverb pedal blending shimmering octave-up effects, glitchy delays, and a unique 'wave burning' tremolo for an atmospheric and experimental soundscape." It sits in the experimental corner of the reverb pedal field, aimed at players who want ambience with texture and movement rather than a plain room sound.1
The controls
The pedal keeps its panel small: four knobs cover the whole effect.
| Control | What it does |
|---|---|
| Verb | Adjusts reverb size, from subtle ambience to massive, immersive echoes |
| Glch | Adds chaotic grain delays and glitch-like textures to the reverb |
| Burn | Engages a random tremolo after the reverb, from gentle, natural modulation to deep, jagged waveforms |
| Mix | Sets the overall effect level compared to the dry signal |
All four control descriptions come from Delicious Audio's report on the pedal.1
The verb knob works like the size control on most reverbs, setting how large the space sounds. The glch knob is where the Pyroglyphs departs from a conventional reverb: it layers grain delays and glitch-like textures into the reverb tail, the kind of fragmented, granular character more often associated with experimental delay pedals.1
Wave burning tremolo
The burn control places a random tremolo after the reverb, and Glowfly's "wave burning" name refers to this stage of the circuit. Because the tremolo is random rather than clocked, Delicious Audio describes the range as running from "gentle, natural modulation to deep, jagged waveforms," so the effect can read as subtle movement at low settings and as irregular, choppy swells at higher ones. Players interested in conventional pulsing volume effects can compare it with dedicated tremolo pedals, which typically offer steady, selectable waveforms instead.1
Footswitches
The Pyroglyphs carries two footswitches with separate jobs:
- Left footswitch: handles soft-touch bypass1.
- Right footswitch: triggers momentary runaway reverb swells1.
The momentary swell on the right switch is held, not latched: the runaway reverb builds while the switch is pressed. Soft-touch bypass means the left switch does not click mechanically when engaged.1
Videos
Glowfly Pedals
Nick Rees
Pedal Experiments
Questions
Where is the Glowfly Pyroglyphs made?
The Glowfly Pyroglyphs is hand-built in Lancashire, UK, according to Delicious Audio's report on the pedal. Glowfly is a small builder, and the hand-built origin is part of how the pedal is presented to players.
What is "wave burning" tremolo?
Wave burning is Glowfly's name for the effect on the burn control: a random tremolo placed after the reverb. Delicious Audio describes it as adding anything from gentle, natural modulation to deep, jagged waveforms, so the tremolo shape is irregular rather than a steady pulse.
What does the right footswitch do on the Glowfly Pyroglyphs?
The right footswitch triggers momentary runaway reverb swells. It is a momentary function, so the swell happens only while you hold the switch, while the left footswitch handles soft-touch bypass.
Does the Glowfly Pyroglyphs have octave-up reverb?
Yes. Delicious Audio describes the pedal as blending shimmering octave-up effects with glitchy delays and the wave-burning tremolo, placing it among shimmer-style reverb pedals that add an octave-up layer to the reverb trail.
Sources (1)
- New Pedal: Glowfly Pyroglyphs Reverb, Delicious Audio, 2025-05-28