A Uni-Vibe is a modulation effect that is often labelled as a Chorus/Vibrato but is in fact a phaser. The difference lies in how it's done: the uni-vibe uses a series of staggered filters that are phased, rather than aligned filters like you'd find on a standard phaser. Uni-vibes also do not use op-amp circuits for their sound. The result is that incredible swampy, pulsating effect that you hear on songs such as Jimi Hendrix's 'Machine Gun'.

Should my modulation pedals go before or after my distortion on my pedal board?

Popular consensus would dictate 'after', since the distortion will be flanged, (rather than a flanger being distorted, if you see what we mean) and will therefore sound more obvious and dramatic. If you are using a flanger, this is how you'll achieve those 'jet engine' noises. Not every one does this, though: one very influential moulation user, Eddie Van Halen, had neither a distortion pedal nor an effects loop and so he simply put all of his MXR pedals into the front end of his end and turned everything up. He changed history with his guitar sound so who are we to argue?

How many modulation effects can I use at once?

You can use literally as many as you can get your hands on! Blending modulations and stacking them up can be interesting and rewarding but there does come a point where, without sounding too facetious about it, four flangers doesn't really sound that different than three. With modulation effects, less is very often more, especially if big sonic gestures are being made. Don't let us stop you though: experimentation is what it's all about!

What is the best setting for the single knob on the MXR Phase 90?

Whether you want that awesome 'Eruption' sound or the haunting Pink Floyd 'Shine On' tone, your Phase 90's rate control should be set between nine and ten o'clock. Perfection lies therein.

Did Andy Summers use a Chorus or a Flanger with the Police?

Andy Summers' famously effected sound is responsible for lots of guitarists buying up chorus pedals left, right and centre in a quest to nail that tone. It's a shame for them all because that is most definitely a flanger on Summers' pedalboard. Namely, an Electro Harmonix Electric Mistress. Unlike the Deluxe model which had both Flanger and Chorus settings, Andy's regular Electric Mistress was a Flanger only. Medium settings on most vintage-styled flangers will get you close and, as ever, listen with your ears and not your eyes!

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Dunlop Authentic Hendrix 68 Shrine Series Uni-Vibe Chorus/Vibrato Mini Pedal

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Fulltone Custom Shop Mini Dejavibe MKII Chorus/Vibrato Pedal

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EarthQuaker Devices Aurelius Tri-Voice Chorus Pedal

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Modulation Pedals

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Landlord FX Brewers Droop BBD Chorus Mini Pedal

MXR M234 Analog Chorus

BOSS CH-1 Super Chorus

MXR Phase 90 Pedal M101 Phaser

MXR M68 Univibe Chorus/Vibrato

MXR Phase 95 Phaser

BOSS CE-2W Chorus Waza Craft Special

MXR Phase 90 Script LED Phaser

BOSS CE-5 Chorus

Landlord FX Dutch Courage Phaser

BOSS BF-3 Flanger

BOSS PH-3 Phaser

Landlord FX Watering Hole Flanger

Electro Harmonix Nano Small Stone Phaser

Electro Harmonix Walking On The Moon Flanger

BOSS DC-2W Dimension C Waza Craft

MXR Micro Flanger M152

Electro Harmonix Neo Clone Analog Chorus

Electro Harmonix Nano Clone Chorus

MXR M83 Bass Chorus Deluxe

Electro Harmonix Bass Clone Chorus

BOSS CEB-3 Bass Chorus

Way Huge Smalls Blue Hippo Analog Chorus

Ampeg Liquifier Bass Chorus

MXR M279 Deep Phase Mini Pedal

Electro Harmonix Eddy Analog Vibrato Chorus

Dunlop Authentic Hendrix 68 Shrine Series Uni-Vibe Chorus/Vibrato Mini Pedal

Fulltone Custom Shop Mini Dejavibe MKII Chorus/Vibrato Pedal

EarthQuaker Devices Aurelius Tri-Voice Chorus Pedal

Walrus Audio Julianna Chorus/Vibrato

MXR EVH Flanger EVH117

Dod Phasor 201 Phaser Pedal

JHS Pedals Unicorn V2 Vibrato

Mooer MFL1 E-lady Analog Flanger Mini Pedal

Fender Waylon Jennings Phaser

Way Huge Attack Vector Phaser and Envelope Filter

Fairfield Circuitry Roger That FM Modulator

Laney Black Country Customs Spiral Array Chorus

MXR '74 Vintage Phase 90

MXR EVH Phase 90 EVH90 Phaser

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