The Holy Island Audio Blast Radius is an expression controlled oscillating fuzz pedal, designed to add unpredictable and unstable textures to a signal. It is an analog, silicon fuzz circuit in a compact enclosure, built around three independent gain stages that can be toggled in and out to create combinations of gain and oscillation. according to RockBoard's PedalPedia, it can produce a range of sounds from heavy fuzz tones to trashy lo fi oscillations and chaotic sonic artifacts1.
What it does to a sound
The Blast Radius is built to be unruly. Its three gain stages can be switched in and out independently, so the player chooses the combinations of gain and oscillation rather than a single fixed fuzz voicing1. Alongside the gain stages, the main blast control affects the overall fuzz intensity and character1.
The pedal's other signature control is the starve control, which reduces the voltage reaching the circuit to introduce instability and oscillation. Voltage starvation is a long-standing trick for making a fuzz misbehave, and here it is a front-panel control rather than a one-way mod1.
Expression control
An expression pedal can be connected to control the blast knob hands free1. That turns the blast control, which shapes the fuzz intensity and character, into a playable parameter: the player can sweep between gain and oscillation settings mid-phrase without bending down to turn a knob. For players who already use an expression pedal on a delay or filter pedal, the Blast Radius slots into the same habit.
Versions and availability
The Blast Radius was first released in July 2025, when Guitar Pedal X reported the announcement of the expression controlled oscillating fuzz with three independently selectable gain stages, listed at £135 on the Holy Island Audio webstore3. Since then it has appeared in several colourways:
| Version | Appearance | Status |
|---|---|---|
| Original | Yellow and black | First release, July 20252 |
| Pink Edition | Pink | Followed the original2 |
| Glow-in-the-Dark Edition | Off-white | Limited batch, reported sold out as of October 20262 |
The Glow-in-the-Dark Edition was a limited batch. Guitar Pedal X's Stefan Karlsson, reviewing it in October 2026, reported "This batch is alas sold out - I was lucky to get in on it"2. Holy Island Audio's pedals have generally been issued in batches, so later colourways may not be continuously available.
The price has held steady across versions: the Glow-in-the-Dark Edition also came in at £135, which Karlsson called "incredible value"2, and a colourway edition was listed at £135 as early as June 20264.
What reviewers said
Guitar Pedal X's Stefan Karlsson reviewed the Glow-in-the-Dark Edition in October 2026 and was broadly enthusiastic. He described the Blast Radius as delivering "days of fun exploration, and is an absolute joy to deploy - with incredible overall range and" versatility2. He also noted that he tends to favor compact pedals and called this one "an amazing Quadfecta"2.
On the colourways, Karlsson said of the Pink Edition that he "didn't like as much as the yellow original, but best of all" was the Glow-in-the-Dark Edition that followed it2.
Holy Island Audio also builds other pedals in a similar spirit, including the Micro Mountain Mover and the Angel Teeth, for players exploring the maker's range.
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Questions
Can I control the Blast Radius with an expression pedal?
Yes. The Blast Radius has an expression input, and an expression pedal can be connected to control the blast knob hands free. Since the blast control affects the overall fuzz intensity and character, that means you can sweep the pedal's core sound while playing, which is the feature that sets it apart from a conventional fuzz.
Is the Holy Island Audio Blast Radius analog or digital?
The Blast Radius is an analog pedal. RockBoard's PedalPedia lists its circuit type as analog, and Guitar Pedal X describes it as a silicon fuzz. It is a compact pedal built around three independent gain stages that can be toggled in and out to create combinations of gain and oscillation.
Is the Blast Radius still available?
The pedal was first released in July 2025, and Holy Island Audio has since issued it in several colourways: the yellow original, a Pink Edition, and a Glow-in-the-Dark Edition. The Glow-in-the-Dark batch was reported sold out as of October 2026, so availability depends on when the maker runs its next batch.
What is the Glow-in-the-Dark Edition of the Blast Radius?
The Glow-in-the-Dark Blast Radius is an off-white variant of Holy Island Audio's oscillating fuzz, released as a limited batch after the yellow original and the Pink Edition. Guitar Pedal X's Stefan Karlsson reviewed it in October 2026 and reported that the batch had sold out, at a price of £135.
Sources (4)
- Blast Radius by Holy Island Audio, RockBoard PedalPedia, 2026
- Guitar Pedal X, Guitar Pedal X
- Guitar Pedal X, Guitar Pedal X, 2025-07-25
- Guitar Pedal X, Guitar Pedal X, 2026-06-10
