Skip to main content
MusicRadar MusicRadar The No.1 website for musicians
UK EditionUK US EditionUS AU EditionAustralia SG EditionSingapore
Sign in
  • View Profile
  • Sign out
  • Artist news
  • Guitars
  • Controllers
  • Drums
  • Keyboards & Pianos
  • Guitar Amps
  • Music Gear Reviews
  • Synths
  • Software & Apps
  • More
    • Recording
    • DJ Gear
    • Acoustic Guitars
    • Bass Guitars
    • Tech
    • Tutorials
    • Reviews
    • Buying Guides
    • About us
More
  • Tiny Dancer
  • Browser DAWs
  • 95k+ free music samples
  • Restring your guitar
  1. Guitars
  2. Guitar Pedals

Review round-up: offbeat modulation pedals

News
By Alex Lynham
Published 26 February 2019

Inspirational options from Keeley, Pigtronix, Boss and Valeton

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Need some new ideas? Got some cash to burn? Whatever the reason, we’ve got just the thing. 

Don't Miss

The 10 best chorus pedals for guitar

This rogue’s gallery of modulation pedals will do it all, from boutique modulation to analogue synthesis. 

With the Dimension C, we’re seeing the return of perhaps the best stompbox chorus ever. Not only that, but in this Waza reissue, a switch to change it over to a SDD-320 mode, emulating the rack effect the original was based on. The SDD-320 fetches astronomical prices on the used market, so its inclusion is a win-win. 

Meanwhile, with the Coral, we’ve got a wallet-friendly, pocket-sized do-it-all box to spark new song ideas while you’re noodling. So whether you’re curious about phaser, flanger or ring modulator, step on up! 

Page 1 of 5
Page 1 of 5
Keeley Bubble Tron

Keeley Bubble Tron

This multi-function modulation pedal is aimed at guitarists who want to box off several modulation options with a single pedal. 

With a filter, phaser and flanger, the core filter-based modulation sounds are all accounted for and deliver pretty much what you’d expect. There are some pleasant surprises at the extreme ends of the controls for rate and depth, with psyched-out, weird sounds and artifacts aplenty, but most people will be after belt-and-braces decent mod settings, and those are here too. 

We found the phaser most compelling with the depth and speed pulled back for some '70s prog vibes. 

4 out of 5

Page 2 of 5
Page 2 of 5
Boss DC-2W

Boss DC-2W

The original Boss Dimension C was a stereo chorus that had the relatively unique distinction of using two parallel analogue BBD paths to create its sound. 

That lush, 80s chorus is delivered in spades by the Dimension C, while updates have found issues with the original – noise and low output volume - largely mitigated. Mode 1 is great for subtle, Siamese Dream-style Smashing Pumpkins tones, while at the other extreme in Mode 4, think She Sells Sanctuary by The Cult. 

It’s an expensive beast, but this is a unique chorus sound, magnificently executed, and available again at long last. 

4.5 out of 5

Page 3 of 5
Page 3 of 5
Pigtronix Ringmaster Analog Multiplier

Pigtronix Ringmaster Analog Multiplier

The Ringmaster is an analogue synthesiser and ring modulator with a ton of controls. 

Even without diving into the different carrier and CV options, the front panel can be a little overwhelming and takes some time to dial in a good sound. Fuzzy, grainy ring mod tones are the easiest to tap, but with some tweaking there’s also tremolo and sample-hold sounds possible, with harmonised notes dancing around the input signal. 

It feels at times like it might better suit a keyboard rather than a guitar, but it’s hard to think of a more feature-rich ring modulator on the market. 

4 out of 5

Page 4 of 5
Page 4 of 5
Valeton Coral MDR

Valeton Coral MDR

If what you’re looking for is a pedal to trigger inspiration, then it’s hard to go wrong with the Valeton Coral MDR. 

MDR stands for modulation, delay, reverb, and this compact box gets every last mile out of the digital chip nestled inside. There are eight patches, with a further eight accessible via a toggle switch, and the footswitch even works for tap-tempo, though it’s a hair short of foolproof. 

Some sounds are gimmicky, but the sine and square wave tremolo are great, and both the phaser and reverb ‘A’ are decent. It’s fiddly because of its size, but the core sounds aren’t bad at all - so at this price, why not? 

4 out of 5

Page 5 of 5
Page 5 of 5
Alex Lynham
Alex Lynham

Alex Lynham is a gear obsessive who's been collecting and building modern and vintage equipment since he got his first Saturday job. Besides reviewing countless pedals for Total Guitar, he's written guides on how to build your first pedal, how to build a tube amp from a kit, and briefly went viral when he released a glitch delay pedal, the Atom Smasher.

Read more
Neural DSP Quad Cortex
Guitar Pedals Best multi-effects pedals 2026: Our pick of the best all-in-one guitar FX modellers
 
 
Three new additions to the $99 JHS Pedals range: Glitch Delay, Bit Crusher and Ring Modulator – all compact stompboxes with white enclosures and three knobs
Guitars Meet the $99 stompbox that’ll crush your bits – JHS expands its affordable 3 Series with three exotic effects for your pedalboard
 
 
MusicRadar Guitar Gear Round-up June 2026
Guitars MusicRadar’s epic guitar gear round-up: June ’26 edit, ft. EHX, PRS, Fender’s mega-launch and more
 
 
Meris Ottobit X
Guitars Meris unveils the Ottobit X, a high-end purveyor of lo-fi guitar sounds inspired by the ‘80s
 
 
Fractal FM4 amp modeller
Guitar Pedals “Make no mistake, it could grace any professional stage”: Fractal AM4 review
 
 
Superbooth 2026
Tech Stochastic sequences to a ‘render farm’ of drums: 8 great Eurorack releases from Superbooth 2026
 
 
Latest in Guitar Pedals
Electro-Harmonix Dual Op-Amp Big Muff Pi 2 Deluxe
Guitars “The final boss of the lost Dual Op-Amp circuit”: Electro-Harmonix unveils Deluxe Big Muff Pi 2
 
 
Strymon TimeLine MX
Guitars Strymon supercharges its flagship delay – meet the TimeLine MX
 
 
Walrus Audio Lüm Texture Engine
Guitars Walrus Audio’s Lüm is a feature-packed “Texture Machine” for when your guitar tone feels predictable
 
 
Electro-Harmonix Dual Op-Amp Big Muff Pi 2
Guitar Pedals Electro-Harmonix Big Muff Pi 2 Dual Op-Amp Fuzz review
 
 
A Blackstar ID:X Floor Three multi-effects pedal and amp modeller on a worn, wooden floor
Guitar Pedals “An effortlessly usable unit that delivers dynamically playable sounds”: Blackstar ID:X Floor Three review
 
 
MusicRadar Guitar Gear Round-up June 2026
Guitars MusicRadar’s epic guitar gear round-up: June ’26 edit, ft. EHX, PRS, Fender’s mega-launch and more
 
 
Latest in News
Singer-songwriter, music producer and member of Coldplay Chris Martin performs in the FIFA World Cup 2026 Final Halftime Show during the FIFA World Cup 2026 Final match at New York New Jersey Stadium on July 19, 2026
Gigs & Festivals 'I thought it was crap": Gallagher, Rooney and others share their views on World Cup half time show
 
 
Jennifer Finch of music group L7 performs onstage at The Art Of Elysium Presents WE ARE HEAR'S HEAVEN 2020 at Hollywood Palladium on January 04, 2020 in Los Angeles, California.
Bands “A true original who lived entirely on her own terms”: L7 announce that bassist Jennifer Finch has died
 
 
roget
Tech "If I was going away on a trip and could only bring one keyboard, I’d bring that one": Rogét Chahayed on the stage keyboard he can't live without
 
 
LONDON, ENGLAND - JULY 08: Mick Jagger during the photocall for the launch of the Rolling Stones' 25th album "Foreign Tongues" at St Clement Hotel on July 08, 2026 in London, England.
Artists “I said, ‘What does it matter?": Mick Jagger didn’t see the point in using tape on the new Stones album
 
 
Lorde performs during day three of Glastonbury festival 2025 at Worthy Farm, Pilton on June 27, 2025 in Glastonbury, England.
Artists "I’m going to go out on a limb and say we don’t want this”: Lorde slams Spotify's About the Song feature
 
 
fdrumbrute
Samples SampleRadar: 493 free hardware drum machine samples
 
 

MusicRadar is part of Future plc, an international media group and leading digital publisher. Visit our corporate site.

Add as a preferred source on Google Add as a preferred source on Google
  • About Us
  • Contact Future's experts
  • Terms and conditions
  • Privacy policy
  • Cookies policy
  • Advertise with us
  • Accessibility Statement
  • Careers

© Future Publishing Limited Quay House, The Ambury, Bath BA1 1UA. All rights reserved. England and Wales company registration number 2008885.

Please login or signup to comment

Please wait...